---
id: "2026-11-06-openai-live-api-outbound-sip-calls"
url: "https://postcutoff.com/e/2026-11-06-openai-live-api-outbound-sip-calls/"
as_of: "2026-11-09T21:13:00+01:00"
date: "2026-11-06"
date_precision: day
category: product
importance: 2
confidence: medium
status: [Partly confirmed]
sources: 1
editor: human editor
human_review: null
version: "2026-11-08"
---

As of: 2026-11-09 21:13 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-11-06-openai-live-api-outbound-sip-calls/

# OpenAI Live API adds outbound SIP phone calls for GPT-Live voice agents

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. Available to all organisations through the Live API. The docs give no release date; it surfaced around Nov 5–7, 2026.

## 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).

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 190 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 129 days after its cutoff
- Gemini 4 Argon (training cutoff March 2026): 220 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 159 days after its cutoff

## Sources

1. [OpenAI docs: Voice over SIP](https://developers.openai.com/api/docs/guides/voice-sip) (developers.openai.com, docs)

## Changes

- 2026-11-08 (filed): Created