From OpenAI Developers · · 1m 30s
OpenAI SIP API for Voice Calls
Connect phone calls to AI voice services using SIP trunking.
In brief
Connect phone calls to AI voice services using SIP trunking. OpenAI's SIP API lets businesses route phone calls through AI voice services with real-time transcription and call control. Originally reported by OpenAI Developers.
GPT-Live Realtime API
Connect incoming and outgoing phone calls to GPT-Live through a SIP trunk.
Handle inbound calls
Receive incoming-call webhook, then accept or reject the call.
Place outbound calls
Create session to dial phone number through your provider.
Use sideband connection
Attach to existing conversation for session events or commands.
Configure phone number
Use sip trunking provider like twilio to connect phone number.
SIP signaling
SIP signaling uses tls, gpt-live requires srtp for call audio.
Receive incoming call
Webhook sends live.transport.incoming event when call arrives.
Accept or reject call
Send authenticated post request to accept or reject call.
Attach backend
Connect sideband websocket after call acceptance.
Outbound call setup
Provider handles phone network connection while gpt-live carries conversation.
SIP trunk configuration
Supply transport.destination and trunk provider details.
Create session
Send post request with session configuration and transport type.
Monitor call events
Track transport.ringing, answered, failed events.
Manage active call
Send keypad tones, transfer calls, or hang up.
SIP network requirements
Allow tcp/tls traffic to sip.api.openai.com on port 5061.
Next steps
Use prompting guide, webhooks, delegation and tools.
The one thing
OpenAI's SIP API lets businesses route phone calls through AI voice services with real-time transcription and call control.
