import Retell from 'retell-sdk';

const client = new Retell({
  apiKey: process.env['RETELL_API_KEY'], // This is the default and can be omitted
});

const phoneCallResponse = await client.call.registerPhoneCall({
  agent_id: 'oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD',
});

console.log(phoneCallResponse.agent_id);

import os
from retell import Retell

client = Retell(
    api_key=os.environ.get("RETELL_API_KEY"),  # This is the default and can be omitted
)
phone_call_response = client.call.register_phone_call(
    agent_id="oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD",
)
print(phone_call_response.agent_id)

curl --request POST \
  --url https://api.retellai.com/v2/register-phone-call \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agent_id": "oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD",
  "agent_version": "latest_published",
  "agent_override": {
    "agent": {
      "response_engine": {
        "type": "retell-llm",
        "llm_id": "llm_234sdertfsdsfsdf",
        "version": 0
      },
      "agent_name": "Jarvis",
      "version_description": "Customer support agent for handling product inquiries",
      "version_title": "Production hotfix",
      "voice_id": "retell-Cimo",
      "fallback_voice_ids": [
        "cartesia-Cimo",
        "minimax-Cimo"
      ],
      "voice_temperature": 1,
      "voice_speed": 1,
      "enable_dynamic_voice_speed": true,
      "enable_dynamic_responsiveness": true,
      "volume": 1,
      "enable_expressive_mode": true,
      "expressive_emotion_tags": [
        "empathetic",
        "excited",
        "sigh",
        "clear throat",
        "emphasis"
      ],
      "expressive_mode_prompt": "Use [sigh] for thoughtful pauses and [excited] for good news.",
      "responsiveness": 1,
      "interruption_sensitivity": 1,
      "enable_backchannel": true,
      "backchannel_frequency": 0.9,
      "backchannel_words": [
        "yeah",
        "uh-huh"
      ],
      "reminder_trigger_ms": 10000,
      "reminder_max_count": 2,
      "ambient_sound_volume": 1,
      "language": "en-US",
      "webhook_url": "https://webhook-url-here",
      "webhook_events": [],
      "webhook_timeout_ms": 10000,
      "boosted_keywords": [
        "retell",
        "kroger"
      ],
      "contact_memory_config": {
        "enable_update": true,
        "enable_read": true
      },
      "data_storage_setting": "everything",
      "data_storage_retention_days": 30,
      "opt_in_signed_url": true,
      "signed_url_expiration_ms": 86400000,
      "pronunciation_dictionary": [
        {
          "word": "actually",
          "alphabet": "ipa",
          "phoneme": "ˈæktʃuəli"
        }
      ],
      "enable_dnc_detection": false,
      "end_call_after_silence_ms": 600000,
      "max_call_duration_ms": 3600000,
      "voicemail_option": {
        "action": {
          "type": "static_text",
          "text": "Please give us a callback tomorrow at 10am."
        }
      },
      "ivr_option": {
        "action": {
          "type": "hangup"
        }
      },
      "call_screening_option": {
        "agent_identity": "Acme Health scheduling team",
        "call_purpose": "confirming your appointment for tomorrow"
      },
      "post_call_analysis_data": [
        {
          "type": "string",
          "name": "customer_name",
          "description": "The name of the customer.",
          "examples": [
            "John Doe",
            "Jane Smith"
          ],
          "required": true,
          "conditional_prompt": "<string>"
        }
      ],
      "post_call_analysis_model": "gpt-4.1-mini",
      "begin_message_delay_ms": 1000,
      "ring_duration_ms": 30000,
      "stt_mode": "fast",
      "custom_stt_config": {
        "endpointing_ms": 123
      },
      "vocab_specialization": "general",
      "allow_user_dtmf": true,
      "allow_dtmf_interruption": false,
      "user_dtmf_options": {
        "digit_limit": 25.5,
        "termination_key": "#",
        "timeout_ms": 8000
      },
      "denoising_mode": "noise-cancellation",
      "denoising_enhancement_level": 0.8,
      "guardrail_config": {
        "output_topics": [],
        "input_topics": [
          "platform_integrity_jailbreaking"
        ]
      },
      "handbook_config": {
        "default_personality": true,
        "conversational_personality": true,
        "natural_filler_words": true,
        "high_empathy": true,
        "echo_verification": true,
        "nato_phonetic_alphabet": true,
        "speech_normalization": true,
        "smart_matching": true,
        "ai_disclosure": true,
        "scope_boundaries": true
      },
      "timezone": "America/New_York",
      "pre_session_tools": [
        {
          "type": "integration_app",
          "name": "<string>",
          "app_id": "<string>",
          "provider": "<string>",
          "app_tool_template_name": "<string>",
          "parameters": [
            {
              "type": "object",
              "properties": {},
              "required": [
                "<string>"
              ],
              "additionalProperties": true
            }
          ],
          "execution_status_variable": "<string>",
          "response_variables": {
            "contact_first_name": "data.first_name"
          },
          "output_selection": {
            "mode": "all",
            "fields": [
              "<string>"
            ]
          },
          "description": "<string>",
          "speak_during_execution": true,
          "speak_after_execution": true,
          "execution_message_description": "<string>",
          "enable_typing_sound": true,
          "depends_on": [
            "<string>"
          ]
        }
      ],
      "post_session_tools": [
        {
          "type": "integration_app",
          "name": "<string>",
          "app_id": "<string>",
          "provider": "<string>",
          "app_tool_template_name": "<string>",
          "parameters": [
            {
              "type": "object",
              "properties": {},
              "required": [
                "<string>"
              ],
              "additionalProperties": true
            }
          ],
          "execution_status_variable": "<string>",
          "response_variables": {
            "contact_first_name": "data.first_name"
          },
          "output_selection": {
            "mode": "all",
            "fields": [
              "<string>"
            ]
          },
          "description": "<string>",
          "speak_during_execution": true,
          "speak_after_execution": true,
          "execution_message_description": "<string>",
          "enable_typing_sound": true,
          "depends_on": [
            "<string>"
          ]
        }
      ]
    },
    "retell_llm": {
      "model_config": {
        "type": "cascading",
        "backup": {
          "kick_in_timeout_ms": 30150
        },
        "temperature": 0
      },
      "backup_model": {
        "type": "cascading",
        "high_priority": true,
        "ultrafast": true,
        "backup_kick_in_timeout": 30150
      },
      "model": "gpt-5.6-terra",
      "s2s_model": "gpt-realtime-1.5",
      "model_temperature": 0,
      "model_high_priority": true,
      "model_ultrafast": true,
      "knowledge_base_ids": [
        "<string>"
      ],
      "kb_config": {
        "top_k": 3,
        "filter_score": 0.6
      },
      "begin_after_user_silence_ms": 2000,
      "begin_message": "Hey I am a virtual assistant calling from Retell Hospital."
    },
    "conversation_flow": {
      "model_config": {
        "type": "cascading",
        "backup": {
          "kick_in_timeout_ms": 30150
        },
        "temperature": 0
      },
      "backup_model": {
        "type": "cascading",
        "high_priority": true,
        "ultrafast": true,
        "backup_kick_in_timeout": 30150
      },
      "model_choice": {
        "type": "cascading",
        "high_priority": true,
        "ultrafast": true
      },
      "model_temperature": 0.7,
      "knowledge_base_ids": [
        "kb_001",
        "kb_002"
      ],
      "kb_config": {
        "top_k": 3,
        "filter_score": 0.6
      },
      "start_speaker": "agent",
      "begin_after_user_silence_ms": 2000
    }
  },
  "from_number": "+14157774444",
  "to_number": "+12137774445",
  "direction": "inbound",
  "metadata": {},
  "retell_llm_dynamic_variables": {
    "customer_name": "John Doe"
  }
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.retellai.com/v2/register-phone-call",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'agent_id' => 'oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD',
    'agent_version' => 'latest_published',
    'agent_override' => [
        'agent' => [
                'response_engine' => [
                                'type' => 'retell-llm',
                                'llm_id' => 'llm_234sdertfsdsfsdf',
                                'version' => 0
                ],
                'agent_name' => 'Jarvis',
                'version_description' => 'Customer support agent for handling product inquiries',
                'version_title' => 'Production hotfix',
                'voice_id' => 'retell-Cimo',
                'fallback_voice_ids' => [
                                'cartesia-Cimo',
                                'minimax-Cimo'
                ],
                'voice_temperature' => 1,
                'voice_speed' => 1,
                'enable_dynamic_voice_speed' => true,
                'enable_dynamic_responsiveness' => true,
                'volume' => 1,
                'enable_expressive_mode' => true,
                'expressive_emotion_tags' => [
                                'empathetic',
                                'excited',
                                'sigh',
                                'clear throat',
                                'emphasis'
                ],
                'expressive_mode_prompt' => 'Use [sigh] for thoughtful pauses and [excited] for good news.',
                'responsiveness' => 1,
                'interruption_sensitivity' => 1,
                'enable_backchannel' => true,
                'backchannel_frequency' => 0.9,
                'backchannel_words' => [
                                'yeah',
                                'uh-huh'
                ],
                'reminder_trigger_ms' => 10000,
                'reminder_max_count' => 2,
                'ambient_sound_volume' => 1,
                'language' => 'en-US',
                'webhook_url' => 'https://webhook-url-here',
                'webhook_events' => [
                                
                ],
                'webhook_timeout_ms' => 10000,
                'boosted_keywords' => [
                                'retell',
                                'kroger'
                ],
                'contact_memory_config' => [
                                'enable_update' => true,
                                'enable_read' => true
                ],
                'data_storage_setting' => 'everything',
                'data_storage_retention_days' => 30,
                'opt_in_signed_url' => true,
                'signed_url_expiration_ms' => 86400000,
                'pronunciation_dictionary' => [
                                [
                                                                'word' => 'actually',
                                                                'alphabet' => 'ipa',
                                                                'phoneme' => 'ˈæktʃuəli'
                                ]
                ],
                'enable_dnc_detection' => false,
                'end_call_after_silence_ms' => 600000,
                'max_call_duration_ms' => 3600000,
                'voicemail_option' => [
                                'action' => [
                                                                'type' => 'static_text',
                                                                'text' => 'Please give us a callback tomorrow at 10am.'
                                ]
                ],
                'ivr_option' => [
                                'action' => [
                                                                'type' => 'hangup'
                                ]
                ],
                'call_screening_option' => [
                                'agent_identity' => 'Acme Health scheduling team',
                                'call_purpose' => 'confirming your appointment for tomorrow'
                ],
                'post_call_analysis_data' => [
                                [
                                                                'type' => 'string',
                                                                'name' => 'customer_name',
                                                                'description' => 'The name of the customer.',
                                                                'examples' => [
                                                                                                                                'John Doe',
                                                                                                                                'Jane Smith'
                                                                ],
                                                                'required' => true,
                                                                'conditional_prompt' => '<string>'
                                ]
                ],
                'post_call_analysis_model' => 'gpt-4.1-mini',
                'begin_message_delay_ms' => 1000,
                'ring_duration_ms' => 30000,
                'stt_mode' => 'fast',
                'custom_stt_config' => [
                                'endpointing_ms' => 123
                ],
                'vocab_specialization' => 'general',
                'allow_user_dtmf' => true,
                'allow_dtmf_interruption' => false,
                'user_dtmf_options' => [
                                'digit_limit' => 25.5,
                                'termination_key' => '#',
                                'timeout_ms' => 8000
                ],
                'denoising_mode' => 'noise-cancellation',
                'denoising_enhancement_level' => 0.8,
                'guardrail_config' => [
                                'output_topics' => [
                                                                
                                ],
                                'input_topics' => [
                                                                'platform_integrity_jailbreaking'
                                ]
                ],
                'handbook_config' => [
                                'default_personality' => true,
                                'conversational_personality' => true,
                                'natural_filler_words' => true,
                                'high_empathy' => true,
                                'echo_verification' => true,
                                'nato_phonetic_alphabet' => true,
                                'speech_normalization' => true,
                                'smart_matching' => true,
                                'ai_disclosure' => true,
                                'scope_boundaries' => true
                ],
                'timezone' => 'America/New_York',
                'pre_session_tools' => [
                                [
                                                                'type' => 'integration_app',
                                                                'name' => '<string>',
                                                                'app_id' => '<string>',
                                                                'provider' => '<string>',
                                                                'app_tool_template_name' => '<string>',
                                                                'parameters' => [
                                                                                                                                [
                                                                                                                                                                                                                                                                'type' => 'object',
                                                                                                                                                                                                                                                                'properties' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                ],
                                                                                                                                                                                                                                                                'required' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                '<string>'
                                                                                                                                                                                                                                                                ],
                                                                                                                                                                                                                                                                'additionalProperties' => true
                                                                                                                                ]
                                                                ],
                                                                'execution_status_variable' => '<string>',
                                                                'response_variables' => [
                                                                                                                                'contact_first_name' => 'data.first_name'
                                                                ],
                                                                'output_selection' => [
                                                                                                                                'mode' => 'all',
                                                                                                                                'fields' => [
                                                                                                                                                                                                                                                                '<string>'
                                                                                                                                ]
                                                                ],
                                                                'description' => '<string>',
                                                                'speak_during_execution' => true,
                                                                'speak_after_execution' => true,
                                                                'execution_message_description' => '<string>',
                                                                'enable_typing_sound' => true,
                                                                'depends_on' => [
                                                                                                                                '<string>'
                                                                ]
                                ]
                ],
                'post_session_tools' => [
                                [
                                                                'type' => 'integration_app',
                                                                'name' => '<string>',
                                                                'app_id' => '<string>',
                                                                'provider' => '<string>',
                                                                'app_tool_template_name' => '<string>',
                                                                'parameters' => [
                                                                                                                                [
                                                                                                                                                                                                                                                                'type' => 'object',
                                                                                                                                                                                                                                                                'properties' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                ],
                                                                                                                                                                                                                                                                'required' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                '<string>'
                                                                                                                                                                                                                                                                ],
                                                                                                                                                                                                                                                                'additionalProperties' => true
                                                                                                                                ]
                                                                ],
                                                                'execution_status_variable' => '<string>',
                                                                'response_variables' => [
                                                                                                                                'contact_first_name' => 'data.first_name'
                                                                ],
                                                                'output_selection' => [
                                                                                                                                'mode' => 'all',
                                                                                                                                'fields' => [
                                                                                                                                                                                                                                                                '<string>'
                                                                                                                                ]
                                                                ],
                                                                'description' => '<string>',
                                                                'speak_during_execution' => true,
                                                                'speak_after_execution' => true,
                                                                'execution_message_description' => '<string>',
                                                                'enable_typing_sound' => true,
                                                                'depends_on' => [
                                                                                                                                '<string>'
                                                                ]
                                ]
                ]
        ],
        'retell_llm' => [
                'model_config' => [
                                'type' => 'cascading',
                                'backup' => [
                                                                'kick_in_timeout_ms' => 30150
                                ],
                                'temperature' => 0
                ],
                'backup_model' => [
                                'type' => 'cascading',
                                'high_priority' => true,
                                'ultrafast' => true,
                                'backup_kick_in_timeout' => 30150
                ],
                'model' => 'gpt-5.6-terra',
                's2s_model' => 'gpt-realtime-1.5',
                'model_temperature' => 0,
                'model_high_priority' => true,
                'model_ultrafast' => true,
                'knowledge_base_ids' => [
                                '<string>'
                ],
                'kb_config' => [
                                'top_k' => 3,
                                'filter_score' => 0.6
                ],
                'begin_after_user_silence_ms' => 2000,
                'begin_message' => 'Hey I am a virtual assistant calling from Retell Hospital.'
        ],
        'conversation_flow' => [
                'model_config' => [
                                'type' => 'cascading',
                                'backup' => [
                                                                'kick_in_timeout_ms' => 30150
                                ],
                                'temperature' => 0
                ],
                'backup_model' => [
                                'type' => 'cascading',
                                'high_priority' => true,
                                'ultrafast' => true,
                                'backup_kick_in_timeout' => 30150
                ],
                'model_choice' => [
                                'type' => 'cascading',
                                'high_priority' => true,
                                'ultrafast' => true
                ],
                'model_temperature' => 0.7,
                'knowledge_base_ids' => [
                                'kb_001',
                                'kb_002'
                ],
                'kb_config' => [
                                'top_k' => 3,
                                'filter_score' => 0.6
                ],
                'start_speaker' => 'agent',
                'begin_after_user_silence_ms' => 2000
        ]
    ],
    'from_number' => '+14157774444',
    'to_number' => '+12137774445',
    'direction' => 'inbound',
    'metadata' => [
        
    ],
    'retell_llm_dynamic_variables' => [
        'customer_name' => 'John Doe'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.retellai.com/v2/register-phone-call"

	payload := strings.NewReader("{\n  \"agent_id\": \"oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD\",\n  \"agent_version\": \"latest_published\",\n  \"agent_override\": {\n    \"agent\": {\n      \"response_engine\": {\n        \"type\": \"retell-llm\",\n        \"llm_id\": \"llm_234sdertfsdsfsdf\",\n        \"version\": 0\n      },\n      \"agent_name\": \"Jarvis\",\n      \"version_description\": \"Customer support agent for handling product inquiries\",\n      \"version_title\": \"Production hotfix\",\n      \"voice_id\": \"retell-Cimo\",\n      \"fallback_voice_ids\": [\n        \"cartesia-Cimo\",\n        \"minimax-Cimo\"\n      ],\n      \"voice_temperature\": 1,\n      \"voice_speed\": 1,\n      \"enable_dynamic_voice_speed\": true,\n      \"enable_dynamic_responsiveness\": true,\n      \"volume\": 1,\n      \"enable_expressive_mode\": true,\n      \"expressive_emotion_tags\": [\n        \"empathetic\",\n        \"excited\",\n        \"sigh\",\n        \"clear throat\",\n        \"emphasis\"\n      ],\n      \"expressive_mode_prompt\": \"Use [sigh] for thoughtful pauses and [excited] for good news.\",\n      \"responsiveness\": 1,\n      \"interruption_sensitivity\": 1,\n      \"enable_backchannel\": true,\n      \"backchannel_frequency\": 0.9,\n      \"backchannel_words\": [\n        \"yeah\",\n        \"uh-huh\"\n      ],\n      \"reminder_trigger_ms\": 10000,\n      \"reminder_max_count\": 2,\n      \"ambient_sound_volume\": 1,\n      \"language\": \"en-US\",\n      \"webhook_url\": \"https://webhook-url-here\",\n      \"webhook_events\": [],\n      \"webhook_timeout_ms\": 10000,\n      \"boosted_keywords\": [\n        \"retell\",\n        \"kroger\"\n      ],\n      \"contact_memory_config\": {\n        \"enable_update\": true,\n        \"enable_read\": true\n      },\n      \"data_storage_setting\": \"everything\",\n      \"data_storage_retention_days\": 30,\n      \"opt_in_signed_url\": true,\n      \"signed_url_expiration_ms\": 86400000,\n      \"pronunciation_dictionary\": [\n        {\n          \"word\": \"actually\",\n          \"alphabet\": \"ipa\",\n          \"phoneme\": \"ˈæktʃuəli\"\n        }\n      ],\n      \"enable_dnc_detection\": false,\n      \"end_call_after_silence_ms\": 600000,\n      \"max_call_duration_ms\": 3600000,\n      \"voicemail_option\": {\n        \"action\": {\n          \"type\": \"static_text\",\n          \"text\": \"Please give us a callback tomorrow at 10am.\"\n        }\n      },\n      \"ivr_option\": {\n        \"action\": {\n          \"type\": \"hangup\"\n        }\n      },\n      \"call_screening_option\": {\n        \"agent_identity\": \"Acme Health scheduling team\",\n        \"call_purpose\": \"confirming your appointment for tomorrow\"\n      },\n      \"post_call_analysis_data\": [\n        {\n          \"type\": \"string\",\n          \"name\": \"customer_name\",\n          \"description\": \"The name of the customer.\",\n          \"examples\": [\n            \"John Doe\",\n            \"Jane Smith\"\n          ],\n          \"required\": true,\n          \"conditional_prompt\": \"<string>\"\n        }\n      ],\n      \"post_call_analysis_model\": \"gpt-4.1-mini\",\n      \"begin_message_delay_ms\": 1000,\n      \"ring_duration_ms\": 30000,\n      \"stt_mode\": \"fast\",\n      \"custom_stt_config\": {\n        \"endpointing_ms\": 123\n      },\n      \"vocab_specialization\": \"general\",\n      \"allow_user_dtmf\": true,\n      \"allow_dtmf_interruption\": false,\n      \"user_dtmf_options\": {\n        \"digit_limit\": 25.5,\n        \"termination_key\": \"#\",\n        \"timeout_ms\": 8000\n      },\n      \"denoising_mode\": \"noise-cancellation\",\n      \"denoising_enhancement_level\": 0.8,\n      \"guardrail_config\": {\n        \"output_topics\": [],\n        \"input_topics\": [\n          \"platform_integrity_jailbreaking\"\n        ]\n      },\n      \"handbook_config\": {\n        \"default_personality\": true,\n        \"conversational_personality\": true,\n        \"natural_filler_words\": true,\n        \"high_empathy\": true,\n        \"echo_verification\": true,\n        \"nato_phonetic_alphabet\": true,\n        \"speech_normalization\": true,\n        \"smart_matching\": true,\n        \"ai_disclosure\": true,\n        \"scope_boundaries\": true\n      },\n      \"timezone\": \"America/New_York\",\n      \"pre_session_tools\": [\n        {\n          \"type\": \"integration_app\",\n          \"name\": \"<string>\",\n          \"app_id\": \"<string>\",\n          \"provider\": \"<string>\",\n          \"app_tool_template_name\": \"<string>\",\n          \"parameters\": [\n            {\n              \"type\": \"object\",\n              \"properties\": {},\n              \"required\": [\n                \"<string>\"\n              ],\n              \"additionalProperties\": true\n            }\n          ],\n          \"execution_status_variable\": \"<string>\",\n          \"response_variables\": {\n            \"contact_first_name\": \"data.first_name\"\n          },\n          \"output_selection\": {\n            \"mode\": \"all\",\n            \"fields\": [\n              \"<string>\"\n            ]\n          },\n          \"description\": \"<string>\",\n          \"speak_during_execution\": true,\n          \"speak_after_execution\": true,\n          \"execution_message_description\": \"<string>\",\n          \"enable_typing_sound\": true,\n          \"depends_on\": [\n            \"<string>\"\n          ]\n        }\n      ],\n      \"post_session_tools\": [\n        {\n          \"type\": \"integration_app\",\n          \"name\": \"<string>\",\n          \"app_id\": \"<string>\",\n          \"provider\": \"<string>\",\n          \"app_tool_template_name\": \"<string>\",\n          \"parameters\": [\n            {\n              \"type\": \"object\",\n              \"properties\": {},\n              \"required\": [\n                \"<string>\"\n              ],\n              \"additionalProperties\": true\n            }\n          ],\n          \"execution_status_variable\": \"<string>\",\n          \"response_variables\": {\n            \"contact_first_name\": \"data.first_name\"\n          },\n          \"output_selection\": {\n            \"mode\": \"all\",\n            \"fields\": [\n              \"<string>\"\n            ]\n          },\n          \"description\": \"<string>\",\n          \"speak_during_execution\": true,\n          \"speak_after_execution\": true,\n          \"execution_message_description\": \"<string>\",\n          \"enable_typing_sound\": true,\n          \"depends_on\": [\n            \"<string>\"\n          ]\n        }\n      ]\n    },\n    \"retell_llm\": {\n      \"model_config\": {\n        \"type\": \"cascading\",\n        \"backup\": {\n          \"kick_in_timeout_ms\": 30150\n        },\n        \"temperature\": 0\n      },\n      \"backup_model\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true,\n        \"backup_kick_in_timeout\": 30150\n      },\n      \"model\": \"gpt-5.6-terra\",\n      \"s2s_model\": \"gpt-realtime-1.5\",\n      \"model_temperature\": 0,\n      \"model_high_priority\": true,\n      \"model_ultrafast\": true,\n      \"knowledge_base_ids\": [\n        \"<string>\"\n      ],\n      \"kb_config\": {\n        \"top_k\": 3,\n        \"filter_score\": 0.6\n      },\n      \"begin_after_user_silence_ms\": 2000,\n      \"begin_message\": \"Hey I am a virtual assistant calling from Retell Hospital.\"\n    },\n    \"conversation_flow\": {\n      \"model_config\": {\n        \"type\": \"cascading\",\n        \"backup\": {\n          \"kick_in_timeout_ms\": 30150\n        },\n        \"temperature\": 0\n      },\n      \"backup_model\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true,\n        \"backup_kick_in_timeout\": 30150\n      },\n      \"model_choice\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true\n      },\n      \"model_temperature\": 0.7,\n      \"knowledge_base_ids\": [\n        \"kb_001\",\n        \"kb_002\"\n      ],\n      \"kb_config\": {\n        \"top_k\": 3,\n        \"filter_score\": 0.6\n      },\n      \"start_speaker\": \"agent\",\n      \"begin_after_user_silence_ms\": 2000\n    }\n  },\n  \"from_number\": \"+14157774444\",\n  \"to_number\": \"+12137774445\",\n  \"direction\": \"inbound\",\n  \"metadata\": {},\n  \"retell_llm_dynamic_variables\": {\n    \"customer_name\": \"John Doe\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.retellai.com/v2/register-phone-call")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"agent_id\": \"oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD\",\n  \"agent_version\": \"latest_published\",\n  \"agent_override\": {\n    \"agent\": {\n      \"response_engine\": {\n        \"type\": \"retell-llm\",\n        \"llm_id\": \"llm_234sdertfsdsfsdf\",\n        \"version\": 0\n      },\n      \"agent_name\": \"Jarvis\",\n      \"version_description\": \"Customer support agent for handling product inquiries\",\n      \"version_title\": \"Production hotfix\",\n      \"voice_id\": \"retell-Cimo\",\n      \"fallback_voice_ids\": [\n        \"cartesia-Cimo\",\n        \"minimax-Cimo\"\n      ],\n      \"voice_temperature\": 1,\n      \"voice_speed\": 1,\n      \"enable_dynamic_voice_speed\": true,\n      \"enable_dynamic_responsiveness\": true,\n      \"volume\": 1,\n      \"enable_expressive_mode\": true,\n      \"expressive_emotion_tags\": [\n        \"empathetic\",\n        \"excited\",\n        \"sigh\",\n        \"clear throat\",\n        \"emphasis\"\n      ],\n      \"expressive_mode_prompt\": \"Use [sigh] for thoughtful pauses and [excited] for good news.\",\n      \"responsiveness\": 1,\n      \"interruption_sensitivity\": 1,\n      \"enable_backchannel\": true,\n      \"backchannel_frequency\": 0.9,\n      \"backchannel_words\": [\n        \"yeah\",\n        \"uh-huh\"\n      ],\n      \"reminder_trigger_ms\": 10000,\n      \"reminder_max_count\": 2,\n      \"ambient_sound_volume\": 1,\n      \"language\": \"en-US\",\n      \"webhook_url\": \"https://webhook-url-here\",\n      \"webhook_events\": [],\n      \"webhook_timeout_ms\": 10000,\n      \"boosted_keywords\": [\n        \"retell\",\n        \"kroger\"\n      ],\n      \"contact_memory_config\": {\n        \"enable_update\": true,\n        \"enable_read\": true\n      },\n      \"data_storage_setting\": \"everything\",\n      \"data_storage_retention_days\": 30,\n      \"opt_in_signed_url\": true,\n      \"signed_url_expiration_ms\": 86400000,\n      \"pronunciation_dictionary\": [\n        {\n          \"word\": \"actually\",\n          \"alphabet\": \"ipa\",\n          \"phoneme\": \"ˈæktʃuəli\"\n        }\n      ],\n      \"enable_dnc_detection\": false,\n      \"end_call_after_silence_ms\": 600000,\n      \"max_call_duration_ms\": 3600000,\n      \"voicemail_option\": {\n        \"action\": {\n          \"type\": \"static_text\",\n          \"text\": \"Please give us a callback tomorrow at 10am.\"\n        }\n      },\n      \"ivr_option\": {\n        \"action\": {\n          \"type\": \"hangup\"\n        }\n      },\n      \"call_screening_option\": {\n        \"agent_identity\": \"Acme Health scheduling team\",\n        \"call_purpose\": \"confirming your appointment for tomorrow\"\n      },\n      \"post_call_analysis_data\": [\n        {\n          \"type\": \"string\",\n          \"name\": \"customer_name\",\n          \"description\": \"The name of the customer.\",\n          \"examples\": [\n            \"John Doe\",\n            \"Jane Smith\"\n          ],\n          \"required\": true,\n          \"conditional_prompt\": \"<string>\"\n        }\n      ],\n      \"post_call_analysis_model\": \"gpt-4.1-mini\",\n      \"begin_message_delay_ms\": 1000,\n      \"ring_duration_ms\": 30000,\n      \"stt_mode\": \"fast\",\n      \"custom_stt_config\": {\n        \"endpointing_ms\": 123\n      },\n      \"vocab_specialization\": \"general\",\n      \"allow_user_dtmf\": true,\n      \"allow_dtmf_interruption\": false,\n      \"user_dtmf_options\": {\n        \"digit_limit\": 25.5,\n        \"termination_key\": \"#\",\n        \"timeout_ms\": 8000\n      },\n      \"denoising_mode\": \"noise-cancellation\",\n      \"denoising_enhancement_level\": 0.8,\n      \"guardrail_config\": {\n        \"output_topics\": [],\n        \"input_topics\": [\n          \"platform_integrity_jailbreaking\"\n        ]\n      },\n      \"handbook_config\": {\n        \"default_personality\": true,\n        \"conversational_personality\": true,\n        \"natural_filler_words\": true,\n        \"high_empathy\": true,\n        \"echo_verification\": true,\n        \"nato_phonetic_alphabet\": true,\n        \"speech_normalization\": true,\n        \"smart_matching\": true,\n        \"ai_disclosure\": true,\n        \"scope_boundaries\": true\n      },\n      \"timezone\": \"America/New_York\",\n      \"pre_session_tools\": [\n        {\n          \"type\": \"integration_app\",\n          \"name\": \"<string>\",\n          \"app_id\": \"<string>\",\n          \"provider\": \"<string>\",\n          \"app_tool_template_name\": \"<string>\",\n          \"parameters\": [\n            {\n              \"type\": \"object\",\n              \"properties\": {},\n              \"required\": [\n                \"<string>\"\n              ],\n              \"additionalProperties\": true\n            }\n          ],\n          \"execution_status_variable\": \"<string>\",\n          \"response_variables\": {\n            \"contact_first_name\": \"data.first_name\"\n          },\n          \"output_selection\": {\n            \"mode\": \"all\",\n            \"fields\": [\n              \"<string>\"\n            ]\n          },\n          \"description\": \"<string>\",\n          \"speak_during_execution\": true,\n          \"speak_after_execution\": true,\n          \"execution_message_description\": \"<string>\",\n          \"enable_typing_sound\": true,\n          \"depends_on\": [\n            \"<string>\"\n          ]\n        }\n      ],\n      \"post_session_tools\": [\n        {\n          \"type\": \"integration_app\",\n          \"name\": \"<string>\",\n          \"app_id\": \"<string>\",\n          \"provider\": \"<string>\",\n          \"app_tool_template_name\": \"<string>\",\n          \"parameters\": [\n            {\n              \"type\": \"object\",\n              \"properties\": {},\n              \"required\": [\n                \"<string>\"\n              ],\n              \"additionalProperties\": true\n            }\n          ],\n          \"execution_status_variable\": \"<string>\",\n          \"response_variables\": {\n            \"contact_first_name\": \"data.first_name\"\n          },\n          \"output_selection\": {\n            \"mode\": \"all\",\n            \"fields\": [\n              \"<string>\"\n            ]\n          },\n          \"description\": \"<string>\",\n          \"speak_during_execution\": true,\n          \"speak_after_execution\": true,\n          \"execution_message_description\": \"<string>\",\n          \"enable_typing_sound\": true,\n          \"depends_on\": [\n            \"<string>\"\n          ]\n        }\n      ]\n    },\n    \"retell_llm\": {\n      \"model_config\": {\n        \"type\": \"cascading\",\n        \"backup\": {\n          \"kick_in_timeout_ms\": 30150\n        },\n        \"temperature\": 0\n      },\n      \"backup_model\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true,\n        \"backup_kick_in_timeout\": 30150\n      },\n      \"model\": \"gpt-5.6-terra\",\n      \"s2s_model\": \"gpt-realtime-1.5\",\n      \"model_temperature\": 0,\n      \"model_high_priority\": true,\n      \"model_ultrafast\": true,\n      \"knowledge_base_ids\": [\n        \"<string>\"\n      ],\n      \"kb_config\": {\n        \"top_k\": 3,\n        \"filter_score\": 0.6\n      },\n      \"begin_after_user_silence_ms\": 2000,\n      \"begin_message\": \"Hey I am a virtual assistant calling from Retell Hospital.\"\n    },\n    \"conversation_flow\": {\n      \"model_config\": {\n        \"type\": \"cascading\",\n        \"backup\": {\n          \"kick_in_timeout_ms\": 30150\n        },\n        \"temperature\": 0\n      },\n      \"backup_model\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true,\n        \"backup_kick_in_timeout\": 30150\n      },\n      \"model_choice\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true\n      },\n      \"model_temperature\": 0.7,\n      \"knowledge_base_ids\": [\n        \"kb_001\",\n        \"kb_002\"\n      ],\n      \"kb_config\": {\n        \"top_k\": 3,\n        \"filter_score\": 0.6\n      },\n      \"start_speaker\": \"agent\",\n      \"begin_after_user_silence_ms\": 2000\n    }\n  },\n  \"from_number\": \"+14157774444\",\n  \"to_number\": \"+12137774445\",\n  \"direction\": \"inbound\",\n  \"metadata\": {},\n  \"retell_llm_dynamic_variables\": {\n    \"customer_name\": \"John Doe\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.retellai.com/v2/register-phone-call")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"agent_id\": \"oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD\",\n  \"agent_version\": \"latest_published\",\n  \"agent_override\": {\n    \"agent\": {\n      \"response_engine\": {\n        \"type\": \"retell-llm\",\n        \"llm_id\": \"llm_234sdertfsdsfsdf\",\n        \"version\": 0\n      },\n      \"agent_name\": \"Jarvis\",\n      \"version_description\": \"Customer support agent for handling product inquiries\",\n      \"version_title\": \"Production hotfix\",\n      \"voice_id\": \"retell-Cimo\",\n      \"fallback_voice_ids\": [\n        \"cartesia-Cimo\",\n        \"minimax-Cimo\"\n      ],\n      \"voice_temperature\": 1,\n      \"voice_speed\": 1,\n      \"enable_dynamic_voice_speed\": true,\n      \"enable_dynamic_responsiveness\": true,\n      \"volume\": 1,\n      \"enable_expressive_mode\": true,\n      \"expressive_emotion_tags\": [\n        \"empathetic\",\n        \"excited\",\n        \"sigh\",\n        \"clear throat\",\n        \"emphasis\"\n      ],\n      \"expressive_mode_prompt\": \"Use [sigh] for thoughtful pauses and [excited] for good news.\",\n      \"responsiveness\": 1,\n      \"interruption_sensitivity\": 1,\n      \"enable_backchannel\": true,\n      \"backchannel_frequency\": 0.9,\n      \"backchannel_words\": [\n        \"yeah\",\n        \"uh-huh\"\n      ],\n      \"reminder_trigger_ms\": 10000,\n      \"reminder_max_count\": 2,\n      \"ambient_sound_volume\": 1,\n      \"language\": \"en-US\",\n      \"webhook_url\": \"https://webhook-url-here\",\n      \"webhook_events\": [],\n      \"webhook_timeout_ms\": 10000,\n      \"boosted_keywords\": [\n        \"retell\",\n        \"kroger\"\n      ],\n      \"contact_memory_config\": {\n        \"enable_update\": true,\n        \"enable_read\": true\n      },\n      \"data_storage_setting\": \"everything\",\n      \"data_storage_retention_days\": 30,\n      \"opt_in_signed_url\": true,\n      \"signed_url_expiration_ms\": 86400000,\n      \"pronunciation_dictionary\": [\n        {\n          \"word\": \"actually\",\n          \"alphabet\": \"ipa\",\n          \"phoneme\": \"ˈæktʃuəli\"\n        }\n      ],\n      \"enable_dnc_detection\": false,\n      \"end_call_after_silence_ms\": 600000,\n      \"max_call_duration_ms\": 3600000,\n      \"voicemail_option\": {\n        \"action\": {\n          \"type\": \"static_text\",\n          \"text\": \"Please give us a callback tomorrow at 10am.\"\n        }\n      },\n      \"ivr_option\": {\n        \"action\": {\n          \"type\": \"hangup\"\n        }\n      },\n      \"call_screening_option\": {\n        \"agent_identity\": \"Acme Health scheduling team\",\n        \"call_purpose\": \"confirming your appointment for tomorrow\"\n      },\n      \"post_call_analysis_data\": [\n        {\n          \"type\": \"string\",\n          \"name\": \"customer_name\",\n          \"description\": \"The name of the customer.\",\n          \"examples\": [\n            \"John Doe\",\n            \"Jane Smith\"\n          ],\n          \"required\": true,\n          \"conditional_prompt\": \"<string>\"\n        }\n      ],\n      \"post_call_analysis_model\": \"gpt-4.1-mini\",\n      \"begin_message_delay_ms\": 1000,\n      \"ring_duration_ms\": 30000,\n      \"stt_mode\": \"fast\",\n      \"custom_stt_config\": {\n        \"endpointing_ms\": 123\n      },\n      \"vocab_specialization\": \"general\",\n      \"allow_user_dtmf\": true,\n      \"allow_dtmf_interruption\": false,\n      \"user_dtmf_options\": {\n        \"digit_limit\": 25.5,\n        \"termination_key\": \"#\",\n        \"timeout_ms\": 8000\n      },\n      \"denoising_mode\": \"noise-cancellation\",\n      \"denoising_enhancement_level\": 0.8,\n      \"guardrail_config\": {\n        \"output_topics\": [],\n        \"input_topics\": [\n          \"platform_integrity_jailbreaking\"\n        ]\n      },\n      \"handbook_config\": {\n        \"default_personality\": true,\n        \"conversational_personality\": true,\n        \"natural_filler_words\": true,\n        \"high_empathy\": true,\n        \"echo_verification\": true,\n        \"nato_phonetic_alphabet\": true,\n        \"speech_normalization\": true,\n        \"smart_matching\": true,\n        \"ai_disclosure\": true,\n        \"scope_boundaries\": true\n      },\n      \"timezone\": \"America/New_York\",\n      \"pre_session_tools\": [\n        {\n          \"type\": \"integration_app\",\n          \"name\": \"<string>\",\n          \"app_id\": \"<string>\",\n          \"provider\": \"<string>\",\n          \"app_tool_template_name\": \"<string>\",\n          \"parameters\": [\n            {\n              \"type\": \"object\",\n              \"properties\": {},\n              \"required\": [\n                \"<string>\"\n              ],\n              \"additionalProperties\": true\n            }\n          ],\n          \"execution_status_variable\": \"<string>\",\n          \"response_variables\": {\n            \"contact_first_name\": \"data.first_name\"\n          },\n          \"output_selection\": {\n            \"mode\": \"all\",\n            \"fields\": [\n              \"<string>\"\n            ]\n          },\n          \"description\": \"<string>\",\n          \"speak_during_execution\": true,\n          \"speak_after_execution\": true,\n          \"execution_message_description\": \"<string>\",\n          \"enable_typing_sound\": true,\n          \"depends_on\": [\n            \"<string>\"\n          ]\n        }\n      ],\n      \"post_session_tools\": [\n        {\n          \"type\": \"integration_app\",\n          \"name\": \"<string>\",\n          \"app_id\": \"<string>\",\n          \"provider\": \"<string>\",\n          \"app_tool_template_name\": \"<string>\",\n          \"parameters\": [\n            {\n              \"type\": \"object\",\n              \"properties\": {},\n              \"required\": [\n                \"<string>\"\n              ],\n              \"additionalProperties\": true\n            }\n          ],\n          \"execution_status_variable\": \"<string>\",\n          \"response_variables\": {\n            \"contact_first_name\": \"data.first_name\"\n          },\n          \"output_selection\": {\n            \"mode\": \"all\",\n            \"fields\": [\n              \"<string>\"\n            ]\n          },\n          \"description\": \"<string>\",\n          \"speak_during_execution\": true,\n          \"speak_after_execution\": true,\n          \"execution_message_description\": \"<string>\",\n          \"enable_typing_sound\": true,\n          \"depends_on\": [\n            \"<string>\"\n          ]\n        }\n      ]\n    },\n    \"retell_llm\": {\n      \"model_config\": {\n        \"type\": \"cascading\",\n        \"backup\": {\n          \"kick_in_timeout_ms\": 30150\n        },\n        \"temperature\": 0\n      },\n      \"backup_model\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true,\n        \"backup_kick_in_timeout\": 30150\n      },\n      \"model\": \"gpt-5.6-terra\",\n      \"s2s_model\": \"gpt-realtime-1.5\",\n      \"model_temperature\": 0,\n      \"model_high_priority\": true,\n      \"model_ultrafast\": true,\n      \"knowledge_base_ids\": [\n        \"<string>\"\n      ],\n      \"kb_config\": {\n        \"top_k\": 3,\n        \"filter_score\": 0.6\n      },\n      \"begin_after_user_silence_ms\": 2000,\n      \"begin_message\": \"Hey I am a virtual assistant calling from Retell Hospital.\"\n    },\n    \"conversation_flow\": {\n      \"model_config\": {\n        \"type\": \"cascading\",\n        \"backup\": {\n          \"kick_in_timeout_ms\": 30150\n        },\n        \"temperature\": 0\n      },\n      \"backup_model\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true,\n        \"backup_kick_in_timeout\": 30150\n      },\n      \"model_choice\": {\n        \"type\": \"cascading\",\n        \"high_priority\": true,\n        \"ultrafast\": true\n      },\n      \"model_temperature\": 0.7,\n      \"knowledge_base_ids\": [\n        \"kb_001\",\n        \"kb_002\"\n      ],\n      \"kb_config\": {\n        \"top_k\": 3,\n        \"filter_score\": 0.6\n      },\n      \"start_speaker\": \"agent\",\n      \"begin_after_user_silence_ms\": 2000\n    }\n  },\n  \"from_number\": \"+14157774444\",\n  \"to_number\": \"+12137774445\",\n  \"direction\": \"inbound\",\n  \"metadata\": {},\n  \"retell_llm_dynamic_variables\": {\n    \"customer_name\": \"John Doe\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "call_type": "phone_call",
  "from_number": "+12137771234",
  "to_number": "+12137771235",
  "direction": "inbound",
  "call_id": "Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6",
  "agent_id": "oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD",
  "agent_version": 1,
  "call_status": "registered",
  "telephony_identifier": {
    "twilio_call_sid": "CA5d0d0d8047bf685c3f0ff980fe62c123"
  },
  "agent_name": "My Agent",
  "agent_tag": "prod",
  "metadata": {},
  "retell_llm_dynamic_variables": {
    "customer_name": "John Doe"
  },
  "collected_dynamic_variables": {
    "last_node_name": "Test node"
  },
  "custom_sip_headers": {
    "X-Custom-Header": "Custom Value"
  },
  "data_storage_setting": "everything",
  "opt_in_signed_url": true,
  "start_timestamp": 1703302407333,
  "end_timestamp": 1703302428855,
  "transfer_end_timestamp": 1703302628855,
  "duration_ms": 10000,
  "transcript": "Agent: hi how are you doing?\nUser: Doing pretty well. How are you?\nAgent: That's great to hear! I'm doing well too, thanks! What's up?\nUser: I don't have anything in particular.\nAgent: Got it, just checking in!\nUser: Alright. See you.\nAgent: have a nice day\n",
  "transcript_object": [
    {
      "role": "agent",
      "content": "hi how are you doing?",
      "words": [
        {
          "word": "hi",
          "start": 0.7,
          "end": 1.3
        }
      ],
      "metadata": {
        "response_id": 123,
        "interrupt_id": 123,
        "is_backchannel": true,
        "backup_model_used": {
          "model": "<string>",
          "primary_model": "<string>",
          "backup_model": "<string>",
          "reason": "primary_failed",
          "selection_latency_ms": 123,
          "primary_ready_ms": 123,
          "backup_ready_ms": 123
        }
      }
    }
  ],
  "transcript_with_tool_calls": [
    {
      "role": "agent",
      "content": "hi how are you doing?",
      "words": [
        {
          "word": "hi",
          "start": 0.7,
          "end": 1.3
        }
      ],
      "metadata": {
        "response_id": 123,
        "interrupt_id": 123,
        "is_backchannel": true,
        "backup_model_used": {
          "model": "<string>",
          "primary_model": "<string>",
          "backup_model": "<string>",
          "reason": "primary_failed",
          "selection_latency_ms": 123,
          "primary_ready_ms": 123,
          "backup_ready_ms": 123
        }
      }
    }
  ],
  "scrubbed_transcript_with_tool_calls": [
    {
      "role": "agent",
      "content": "hi how are you doing?",
      "words": [
        {
          "word": "hi",
          "start": 0.7,
          "end": 1.3
        }
      ],
      "metadata": {
        "response_id": 123,
        "interrupt_id": 123,
        "is_backchannel": true,
        "backup_model_used": {
          "model": "<string>",
          "primary_model": "<string>",
          "backup_model": "<string>",
          "reason": "primary_failed",
          "selection_latency_ms": 123,
          "primary_ready_ms": 123,
          "backup_ready_ms": 123
        }
      }
    }
  ],
  "pre_session_transcript_with_tool_calls": [
    {
      "role": "agent",
      "content": "hi how are you doing?",
      "words": [
        {
          "word": "hi",
          "start": 0.7,
          "end": 1.3
        }
      ],
      "metadata": {
        "response_id": 123,
        "interrupt_id": 123,
        "is_backchannel": true,
        "backup_model_used": {
          "model": "<string>",
          "primary_model": "<string>",
          "backup_model": "<string>",
          "reason": "primary_failed",
          "selection_latency_ms": 123,
          "primary_ready_ms": 123,
          "backup_ready_ms": 123
        }
      }
    }
  ],
  "scrubbed_pre_session_transcript_with_tool_calls": [
    {
      "role": "agent",
      "content": "hi how are you doing?",
      "words": [
        {
          "word": "hi",
          "start": 0.7,
          "end": 1.3
        }
      ],
      "metadata": {
        "response_id": 123,
        "interrupt_id": 123,
        "is_backchannel": true,
        "backup_model_used": {
          "model": "<string>",
          "primary_model": "<string>",
          "backup_model": "<string>",
          "reason": "primary_failed",
          "selection_latency_ms": 123,
          "primary_ready_ms": 123,
          "backup_ready_ms": 123
        }
      }
    }
  ],
  "post_session_transcript_with_tool_calls": [
    {
      "role": "agent",
      "content": "hi how are you doing?",
      "words": [
        {
          "word": "hi",
          "start": 0.7,
          "end": 1.3
        }
      ],
      "metadata": {
        "response_id": 123,
        "interrupt_id": 123,
        "is_backchannel": true,
        "backup_model_used": {
          "model": "<string>",
          "primary_model": "<string>",
          "backup_model": "<string>",
          "reason": "primary_failed",
          "selection_latency_ms": 123,
          "primary_ready_ms": 123,
          "backup_ready_ms": 123
        }
      }
    }
  ],
  "scrubbed_post_session_transcript_with_tool_calls": [
    {
      "role": "agent",
      "content": "hi how are you doing?",
      "words": [
        {
          "word": "hi",
          "start": 0.7,
          "end": 1.3
        }
      ],
      "metadata": {
        "response_id": 123,
        "interrupt_id": 123,
        "is_backchannel": true,
        "backup_model_used": {
          "model": "<string>",
          "primary_model": "<string>",
          "backup_model": "<string>",
          "reason": "primary_failed",
          "selection_latency_ms": 123,
          "primary_ready_ms": 123,
          "backup_ready_ms": 123
        }
      }
    }
  ],
  "recording_url": "https://retellai.s3.us-west-2.amazonaws.com/Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6/recording.wav",
  "recording_multi_channel_url": "https://retellai.s3.us-west-2.amazonaws.com/Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6/recording_multichannel.wav",
  "scrubbed_recording_url": "https://retellai.s3.us-west-2.amazonaws.com/Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6/recording.wav",
  "scrubbed_recording_multi_channel_url": "https://retellai.s3.us-west-2.amazonaws.com/Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6/recording_multichannel.wav",
  "public_log_url": "https://retellai.s3.us-west-2.amazonaws.com/Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6/public_log.txt",
  "knowledge_base_retrieved_contents_url": "https://retellai.s3.us-west-2.amazonaws.com/Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6/kb_retrieved_contents.txt",
  "latency": {
    "e2e": {
      "p50": 800,
      "p90": 1200,
      "p95": 1500,
      "p99": 2500,
      "max": 2700,
      "min": 500,
      "num": 10,
      "values": [
        123
      ]
    },
    "asr": {
      "p50": 800,
      "p90": 1200,
      "p95": 1500,
      "p99": 2500,
      "max": 2700,
      "min": 500,
      "num": 10,
      "values": [
        123
      ]
    },
    "llm": {
      "p50": 800,
      "p90": 1200,
      "p95": 1500,
      "p99": 2500,
      "max": 2700,
      "min": 500,
      "num": 10,
      "values": [
        123
      ]
    },
    "llm_websocket_network_rtt": {
      "p50": 800,
      "p90": 1200,
      "p95": 1500,
      "p99": 2500,
      "max": 2700,
      "min": 500,
      "num": 10,
      "values": [
        123
      ]
    },
    "tts": {
      "p50": 800,
      "p90": 1200,
      "p95": 1500,
      "p99": 2500,
      "max": 2700,
      "min": 500,
      "num": 10,
      "values": [
        123
      ]
    },
    "knowledge_base": {
      "p50": 800,
      "p90": 1200,
      "p95": 1500,
      "p99": 2500,
      "max": 2700,
      "min": 500,
      "num": 10,
      "values": [
        123
      ]
    },
    "s2s": {
      "p50": 800,
      "p90": 1200,
      "p95": 1500,
      "p99": 2500,
      "max": 2700,
      "min": 500,
      "num": 10,
      "values": [
        123
      ]
    }
  },
  "disconnection_reason": "agent_hangup",
  "transfer_destination": "+12137771234",
  "call_analysis": {
    "call_summary": "The agent called the user to ask question about his purchase inquiry. The agent asked several questions regarding his preference and asked if user would like to book an appointment. The user happily agreed and scheduled an appointment next Monday 10am.",
    "in_voicemail": false,
    "user_sentiment": "Positive",
    "call_successful": true,
    "custom_analysis_data": {}
  },
  "call_cost": {
    "product_costs": [
      {
        "product": "elevenlabs_tts",
        "cost": 60,
        "unit_price": 1,
        "is_transfer_leg_cost": true
      }
    ],
    "total_duration_seconds": 60,
    "total_duration_unit_price": 1,
    "combined_cost": 70
  },
  "llm_token_usage": {
    "values": [
      123
    ],
    "average": 123,
    "num_requests": 123
  }
}

{
  "status": "error",
  "message": "Invalid request format, please check API reference."
}

{
  "status": "error",
  "message": "API key is missing or invalid."
}

{
  "status": "error",
  "message": "Trial has ended, please add payment method."
}

{
  "status": "error",
  "message": "Cannot find requested asset under given api key."
}

{
  "status": "error",
  "message": "Account rate limited, please throttle your requests."
}

{
  "status": "error",
  "message": "An unexpected server error occurred."
}