Deletes the session's SIP phone and returns the result of the call it placed. The browser should call this as soon as the call ends, including when it failed, and on pagehide with fetch(…, { keepalive: true }) if the visitor navigates away.

A missed call to this endpoint is not a disaster - Reap collects the phone within 5 minutes - but it holds a slot against the concurrency cap in the meantime, so the next visitor may get a 409.

The result payload.

Because the PBX writes the CDR when the call ends and attaches its RTP counters on a separate update a moment later, this endpoint re-reads for up to 2.5 seconds before answering, so the common case resolves in one round trip. If the counters have still not arrived it answers PENDING with a retryAfterMs, and the client should poll Result.