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telephony-integration

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Add or modify telephony providers in assistant-api with transport-aware streamers/webhooks, factory wiring, and codec/resampling compatibility.

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Source SKILL.md: https://github.com/rapidaai/voice-ai/blob/HEAD/.claude/skills/telephony-integration/SKILL.md

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Telephony Integration Skill

Mission

Integrate telephony providers safely across webhook signaling, media streaming, context routing, and disconnect handling.

Inputs expected from user

  1. Transport: WebSocket media stream, SIP RTP/session, AudioSocket TCP, or mixed.
  2. Inbound and outbound call requirements.
  3. Codec/sample-rate constraints from provider.

If user does not answer:

  • Use nearest baseline provider (twilio, exotel, vonage, asterisk, sip).
  • Preserve internal LINEAR16 16kHz core format and use base resampler paths.

Hard boundaries

In scope:

  • api/assistant-api/internal/channel/telephony/internal/<provider>/...
  • api/assistant-api/internal/channel/telephony/telephony.go
  • only if needed: inbound.go, outbound.go, api/assistant-api/internal/type/telephony.go, streamer.go
  • UI telephony provider registration and component files

Out of scope:

  • STT/TTS provider internals
  • EOS/VAD internals
  • integration-api LLM callers

Runtime flow checklist

  1. ReceiveCall parses provider webhook payload into CallInfo.
  2. InboundCall returns provider-specific connect response.
  3. NewStreamer path handles media transport and codec conversion.
  4. StatusCallback and catch-all callback map provider events.
  5. Interruption and end-conversation directives close sessions cleanly.

Transport mapping baselines

  • WebSocket media: twilio, vonage, exotel, asterisk/websocket
  • SIP native session: sip
  • TCP AudioSocket: asterisk/audiosocket

Validation commands

  • go test ./api/assistant-api/internal/channel/telephony/...
  • go test ./api/assistant-api/internal/adapters/internal/...
  • cd ui && yarn test providers
  • ./.claude/skills/telephony-integration/scripts/validate.sh --check-diff --provider <provider>