OpenAI Live API adds outbound SIP phone calls for GPT-Live voice agents
Partly confirmed
The takeaway
OpenAI’s developer docs now describe outbound SIP calling: a developer creates a Live session with SIP transport, a destination number and SIP-trunk details, and GPT-Live places and carries the phone call.
Status
- Claim
Partly confirmed
- Our reporting
- Medium confidence
- Importance
- 2 of 5
- Last verified
- 8 November 2026
Your AI and this story
- GPT-6 Astra190 days after its cutoff
- Claude Opus 5.5129 days after its cutoff
- Gemini 4 Argon220 days after its cutoff
- Grok 4.7159 days after its cutoff
None of these four assistants can know about it. The closest, Claude Opus 5.5, stops 129 days before it.
Key facts
- POST /v1/live/sessions with transport.type ‘sip’; call events transport.ringing / answered / failed over a sideband WebSocket
- ‘Outbound SIP calling is available to all organizations through the Live API, not the Realtime API call-creation endpoint’
- Exact launch date not stated in the docs (date approximate)
What happened
Lets voice agents call people’s phones directly, which also matters for misuse (impersonation calls).
Sources
1 source from 1 site. Numbers match the chips in the text.
1 source: 1 primary
Primary
- OpenAI docs: Voice over SIPdevelopers.openai.com, docs
Changes
- Filed