Share
OpenAI’s voice AI can now pick up the phone and make the call itself. On November 4, 2026, the company announced general availability of its GPT-Live outbound telephony API.
Developers can now point GPT-Live voice agents at real phone numbers and have them dial out. The calls run through compatible SIP trunk providers.
What OpenAI actually shipped
The core feature is outbound calling over SIP, short for Session Initiation Protocol. Think of SIP as the switchboard operator of internet-based phone calls. It sets up the connection, manages it, and hangs up when everyone is done.
Developers don’t need to build that plumbing themselves. They connect GPT-Live to a SIP trunk provider, which links to the traditional phone network.
Named launch partners include Telnyx and Twilio. Ozonetel has also been confirmed as a supported provider.
The external providers handle PSTN termination, meaning they carry the call onto the public switched telephone network. OpenAI keeps control of the audio processing and session logic on its side of the line.
The calls are full-duplex. Both sides can talk and listen at the same time, like a normal human conversation.
AI, tech, and the markets they move—in one daily briefing.
Daily. Free. Join 34,000+ readers across crypto, finance, and policy.
We respect your privacy. Unsubscribe anytime.
HD voice and the end of “press 1” paralysis
Two technical additions stand out. The first is HD Voice support, which means wideband, higher-fidelity audio on calls.
The second is full bidirectional DTMF signaling. DTMF stands for dual-tone multi-frequency. Those are the beeps your phone makes when you tap a number on the keypad.
Bidirectional support means the agent can both send and receive those tones. In practice, a GPT-Live agent can navigate phone menus and IVR systems, the interactive voice response trees that ask you to press 2 for billing.
How we got here
The telephony rollout caps a fast product timeline. GPT-Live-1 launched globally in ChatGPT on July 8, 2026.
It reached the API on September 10, 2026, priced at $0.05 per minute. Less than two months later, it can now place phone calls on its own.
SIP is not the first way to connect GPT-Live to a call. The new telephony path joins existing WebRTC and WebSocket transports.
What this means for developers and businesses
Teams that already use Telnyx, Twilio, or Ozonetel can plug GPT-Live into an existing telephony setup rather than rebuilding it.
The $0.05 per minute API price gives businesses a concrete number to model against. Developers will still need to account for their SIP provider’s carrier charges on top. The full cost of a call is the sum of both bills, not just OpenAI’s line item.
OpenAI is not trying to become a phone carrier. It leaves the network side to established telephony providers and keeps the intelligence layer in-house.
