import Retell from 'retell-sdk';

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

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

console.log(createWebCallResponse.call_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
)
create_web_call_response = client.call.create_web_call(
    agent_id="oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD",
)
print(create_web_call_response.call_id)

curl --request POST \
  --url https://api.retellai.com/v3/create-web-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,
      "voice_emotion": "calm",
      "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"
      ],
      "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"
        }
      ],
      "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",
      "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"
    },
    "retell_llm": {
      "model": "gpt-5.6-terra",
      "s2s_model": "gpt-realtime-1.5",
      "model_temperature": 0,
      "model_high_priority": true,
      "tool_call_strict_mode": 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_temperature": 0.7,
      "tool_call_strict_mode": true,
      "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
    }
  },
  "metadata": {},
  "retell_llm_dynamic_variables": {
    "customer_name": "John Doe"
  },
  "current_node_id": "collect_info",
  "current_state": "information_collection"
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.retellai.com/v3/create-web-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,
                'voice_emotion' => 'calm',
                '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'
                ],
                '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'
                                ]
                ],
                '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',
                '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'
        ],
        'retell_llm' => [
                'model' => 'gpt-5.6-terra',
                's2s_model' => 'gpt-realtime-1.5',
                'model_temperature' => 0,
                'model_high_priority' => true,
                'tool_call_strict_mode' => 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_temperature' => 0.7,
                'tool_call_strict_mode' => true,
                '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
        ]
    ],
    'metadata' => [
        
    ],
    'retell_llm_dynamic_variables' => [
        'customer_name' => 'John Doe'
    ],
    'current_node_id' => 'collect_info',
    'current_state' => 'information_collection'
  ]),
  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/v3/create-web-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      \"voice_emotion\": \"calm\",\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      \"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      \"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      \"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    },\n    \"retell_llm\": {\n      \"model\": \"gpt-5.6-terra\",\n      \"s2s_model\": \"gpt-realtime-1.5\",\n      \"model_temperature\": 0,\n      \"model_high_priority\": true,\n      \"tool_call_strict_mode\": 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_temperature\": 0.7,\n      \"tool_call_strict_mode\": true,\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  \"metadata\": {},\n  \"retell_llm_dynamic_variables\": {\n    \"customer_name\": \"John Doe\"\n  },\n  \"current_node_id\": \"collect_info\",\n  \"current_state\": \"information_collection\"\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/v3/create-web-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      \"voice_emotion\": \"calm\",\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      \"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      \"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      \"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    },\n    \"retell_llm\": {\n      \"model\": \"gpt-5.6-terra\",\n      \"s2s_model\": \"gpt-realtime-1.5\",\n      \"model_temperature\": 0,\n      \"model_high_priority\": true,\n      \"tool_call_strict_mode\": 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_temperature\": 0.7,\n      \"tool_call_strict_mode\": true,\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  \"metadata\": {},\n  \"retell_llm_dynamic_variables\": {\n    \"customer_name\": \"John Doe\"\n  },\n  \"current_node_id\": \"collect_info\",\n  \"current_state\": \"information_collection\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.retellai.com/v3/create-web-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      \"voice_emotion\": \"calm\",\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      \"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      \"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      \"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    },\n    \"retell_llm\": {\n      \"model\": \"gpt-5.6-terra\",\n      \"s2s_model\": \"gpt-realtime-1.5\",\n      \"model_temperature\": 0,\n      \"model_high_priority\": true,\n      \"tool_call_strict_mode\": 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_temperature\": 0.7,\n      \"tool_call_strict_mode\": true,\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  \"metadata\": {},\n  \"retell_llm_dynamic_variables\": {\n    \"customer_name\": \"John Doe\"\n  },\n  \"current_node_id\": \"collect_info\",\n  \"current_state\": \"information_collection\"\n}"

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

{
  "call_id": "call_Jabr9TXYYJHfvl6Syypi88rdAHYHmcq6",
  "access_token": "eyJhbGciOiJIUzI1NiJ9.eyJ2aWRlbyI6eyJyb29tSm9p",
  "transport": "gateway",
  "ice_servers": [
    {
      "urls": "stun:stun.l.google.com:19302",
      "username": "<string>",
      "credential": "<string>"
    }
  ],
  "expires_at": 1735689600000
}

{
  "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."
}