Telephony and SIP | OpenAI API
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OpenAI has added telephony and SIP support to its API, letting developers connect models directly to standard phone networks rather than relying on third-party voice gateways. The capability sits within OpenAI’s Audio & voice tooling, alongside its speech and realtime voice products, and is documented in the API reference covering endpoints, parameters and responses. The move matters because it lowers the integration burden for voice agents and brings OpenAI into closer competition with telephony-focused AI vendors. Developers can now route inbound and outbound calls through SIP trunks while using OpenAI’s models for speech and realtime interaction. What to watch next is pricing and latency details for production call volumes, plus how quickly existing voice-agent platforms adapt their offerings.
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