I really dont understand why we require a Cancel method when we have Bye. I was on the impression that Bye is used to cancel requests that have already established a session; for instance in Invite after receiving an Ack for a 200OK; but the RFC clearly says: section 15 paragraph 1
" The BYE request is used to terminate a specific session or attempted session" and
"The caller's UA MAY send a BYE for either confirmed or early dialogs....."
If we can do all this with a Bye why Cancel?
Thanks, Sindhur.
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