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Capture the SIP headers of the next inbound test call

POST 
/api/v1/phone-numbers/:id/sip-header-capture

Opens a 120-second window. The next inbound INVITE to this number is recorded and rejected with 486 Busy instead of reaching Retell, so its exact headers can be inspected. Poll GET .../sip-header-capture/{sessionId} for the result; raw values expire after 10 minutes and are never stored with mappings. Not needed for forward-all.

Request​

Responses​

Number-scoped capture session.