OpenAI's GPT-Live outbound telephony API is generally available

Justin Uberti, an OpenAI engineer, said on X on November 4 that the GPT-Live outbound telephony API has been promoted to general availability. Developers can now have a GPT-Live voice agent place phone calls through any SIP trunk provider, such as Telnyx or Twilio.

According to the post, calls can use HD Voice and can send and receive keypad (DTMF) events. The how-to is in OpenAI's voice SIP guide, under "place an outbound call".

OpenAI's API changelog lists the change under November 2: outbound SIP calling is available to all organizations through the Live API, connecting GPT-Live to a phone number through a SIP provider (v1/live/sessions).