{"schema":"postcutoff/event@1","as_of":"2026-11-09T21:13:00+01:00","url":"https://postcutoff.com/e/2026-11-06-openai-live-api-outbound-sip-calls/","md":"https://postcutoff.com/e/2026-11-06-openai-live-api-outbound-sip-calls/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-11-06-openai-live-api-outbound-sip-calls","date":"2026-11-06","date_precision":"day","short_title":"OpenAI Live API adds outbound SIP phone calls for GPT-Live voice agents","deck":null,"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.","category":"product","category_label":"Products","importance":2,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":[{"n":1,"title":"OpenAI docs: Voice over SIP","url":"https://developers.openai.com/api/docs/guides/voice-sip","type":"docs","group":"primary","domain":"developers.openai.com"}],"official":1,"filed":"2026-11-08","updated":"2026-11-08","orgs":["OpenAI"],"title":"OpenAI Live API adds outbound SIP phone calls for GPT-Live voice agents","summary":"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)"],"key_numbers":[],"tags":["voice","api","telephony","agents"],"science":null,"body_md":"## What happened\n\nLets voice agents call people's phones directly, which also matters for misuse (impersonation calls).","disputed":[],"related":[],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-11-08","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-11-08","run":null,"sources_read":null,"updated":"2026-11-08","human_review":null,"version":{"date":"2026-11-08"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":190,"in_training_data":false},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":129,"in_training_data":false},{"model_id":"gemini-4-argon","name":"Gemini 4 Argon","cutoff":"2026-03","days_after":220,"in_training_data":false},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":159,"in_training_data":false}],"short_url":null}