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Bind Voice Agents

  • Only when you bind agents to a number will the number be able to receive and make calls.
  • You can assign different inbound and outbound agent to the number.
  • You can leave agent unset to disable inbound / outbound (for example, you are doing outbound and don’t want callbacks, you can leave inbound_agent_id unset)
Phone number configuration showing agent binding for inbound and outbound
After binding an agent for inbound, you should be able to receive inbound calls already.

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A/B Testing

See A/B Testing.

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Inbound Call Webhook

A lot of times, you want to use different agents to handle inbound calls of a number; also you need a way to provide dynamic variables to use for inbound calls, and other fields specific to that call. Read more at Inbound Call Webhook

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Inbound Custom SIP Headers

  • You can use custom SIP headers to pre-set dynamic variables for a call.
  • Retell extracts any header starting with sip.h.x-, along with common SIP headers like Diversion, History-Info, User-To-User and P-Asserted-Identity, and converts each into a dynamic variable by stripping the sip.h. prefix.
    • E.g. sip.h.x-caller: abc -> x-caller: abc
    • E.g. sip.h.p-asserted-identity: +12345678910 -> p-asserted-identity: +12345678910
    • E.g. sip.h.diversion: <sip:2000@192.168.254.254>;privacy=off;reason=no-answer;counter=1;screen=no -> diversion: <sip:2000@192.168.254.254>;privacy=off;reason=no-answer;counter=1;screen=no

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Get Call Detail

  • API: You can use Get Call API to get information like transcript, recording, latency tracking, etc.
  • Webhook: You can also setup webhooks to receive real time updates when call is initiated, ends, and analyzed. Read more at Call Webhook Guide.