SIP FAQ : SIP Protocol Operation : Can I CANCEL requests other than the first INVITE?
	Yes, any request can be cancelled before it has been executed by the UAS. However, it is likely that this will only make sense in practice for the initial INVITE and subsequent re-INVITEs. In the latter case, the call remains, just any changes requests are cancelled.
	[Append to This Answer]
	islepchin@dynamicsoft.com
	2000-Jul-03 9:22pm

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