xAI Docs release notes

No pages were added or removed. Documentation updates across five developer pages:

Voice agent

• Documented audio transport options: codec (format) is separate from wire path (transport). Input/output can use "json" (default, base64) or "binary" (raw codec bytes on WebSocket binary frames), with dual-accept for input and strict output at response boundaries.
• Added Opus (audio/opus) as a supported codec (24 kHz mono, one raw packet per payload).
• Expanded session parameter tables for audio.input.transport / audio.output.transport and codec types.
• Updated send/receive examples for binary PCM (and Opus) without base64.
• Documented Web Search and X Search tool parameters for voice sessions (domains, location, handles, date windows, image/video understanding), including invalid-config error behavior.

Security (Zero Data Retention)

• Reworked the ZDR FAQ: clearer default 30-day retention language and a strong guidance note that most customers should not enable ZDR.
• Replaced “How it works” / “Considerations” with a full features not supported under ZDR table (request logging, stored image/video outputs, voice history, Batch, Collections, deferred completions, Files, stateful Responses API).
• Documented self-serve enable/disable in Console Team Settings (admin steps, file/collection cleanup, acknowledgments) and how to confirm ZDR is active (settings badge, team picker, x-zero-data-retention header, audit logs).

Tools (advanced usage)

• Corrected agentic tool-calling examples so server-side tool items (web_search_call, x_search_call, etc.) log type-specific fields (e.g. action) instead of client-style name/arguments.

API reference & SIP

• Auth (secret rotation): clarified that oldSecretExpireTime defaults to 24 hours from now when not set for non-expired keys.
• Voice agent SIP: clarified that provisioning xAI phone numbers via API is not supported; webhook signing secret is returned in the response for Direct SIP / BYO trunk setup.