|
 SIP FAQ : SIP Protocol Operation :
When is a CANCEL used? |
| - A proxy has forked an INVITE request, and it receives a 200 or 600 response on one of the branches, the proxy CANCELs unanswered branches; - The time described in the Expires header of the request has elapsed; - No response, including provisional, was ever received from downstream nodes; - Internal logic determines its time to end the transaction (a CPL or sip-cgi script, for example). | |
| [Append to This Answer] | |
| hgs@cs.columbia.edu | |
| 2001-Mar-21 11:55pm |
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