SIP modality does not support turnDetection threshold, prefixPaddingMs, silenceDurationMs

[josephtannenbaum]

Please read this first

• Have you read the docs? Agents SDK docs
• Have you searched for related issues? Others may have faced similar issues.

Describe the bug

When I pass threshold to OpenAIRealtimeSIP.buildInitialConfig and try to accept a call, it fails to connect with:

Unhandled error while handling SIP call rtc_u2_8c....: BadRequestError: 400 Unknown parameter: 'session.audio.input.turn_detection.threshold'.

Same for prefixPaddingMs, silenceDurationMs. Is this a limitation of the API itself?

Debug information

• Agents SDK version: 0.3.3
• Runtime environment: Node v22.20.0

Repro steps

Run the demo with any of these options, log the exception in acceptCall

[josephtannenbaum]

I just realized, these props are probably being rejected because they aren't relevant for semantic_vad. But it would be nice if the SDK printed a warning or the API accepted them silently!