speaker timeline for calls recorded

Unfortunately, that metadata is not supported.

If this is critical for your use case, you can download call recordings and use a 3rd party speech-to-text service to transcribe the recording and get other metadata such as speaker ids and timelines etc.

You can also send a request to access RingCentral AI API and you can use the /speech-to-text or the /analyze-interaction API to transcribe call recordings and grab the metadata.