xAI Docs release notes (2026-06-27)
Voice Agent API
- New dedicated page: SIP Phone Calls (
/developers/model-capabilities/audio/voice-agent/sip) covering SIP integration, call control, DTMF handling, and Bring Your Own SIP Provider setup. - Telephony provider examples (Twilio, Telnyx, Plivo) and related DTMF/audit sections moved from the main Voice Agent page to the new SIP page.
- Main Voice Agent page now links to the SIP page for PSTN, contact-center, and PBX routing details.
REST API Reference – Voice
- Added documentation for three new endpoints:
POST /v2/phone-numbers(create xAI-provisioned or BYO-trunk numbers, with webhook and SIP auth options)POST /v1/realtime/calls/{call_id}/hangupPOST /v1/realtime/calls/{call_id}/refer
- Updated WebSocket connection guidance to include
call_idquery parameter support for SIP sessions.
Overview
- Page heading simplified to “Get started”.
No pages were removed.