487 Filter

Owned by Rob Whyte (Unlicensed)
Last updated: Nov 28, 2022 by Kelly Evans (Unlicensed)
1 min read

A 487 SIP response indicates the request has terminated by bye or cancel.

For example, a SIP User Agent Server (UAS) sends the 487 response to the client after the client sends a CANCEL request for the original unanswered INVITE request (and has yet to receive a final response).

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