[SR-Users] t_relay_cancel usage

Andrei Pelinescu-Onciul andrei at iptel.org
Thu Oct 7 14:46:40 CEST 2010


On Oct 07, 2010 at 13:52, Juha Heinanen <jh at tutpro.com> wrote:
> in tm readme there is this kind of example regarding use of
> t_relay_cancel:
> 
> if (method == CANCEL) {
> 	if (!t_relay_cancel()) {  # implicit drop if relaying was successful,
>                                   # nothing to do
> 
> 		# corresponding INVITE transaction found but error occurred
> 		sl_reply("500", "Internal Server Error");
> 		drop;
> 	}
> 	# bad luck, corresponding INVITE transaction is missing,
> 	# do the same as for INVITEs
> }
> 
> if proxy is processing all invites statefully, why anything needs to be
> done when invite transaction corresponding the to cancel is missing?
> isn't it a case of unmatched cancel and the cancel could just be
> dropped?

Well, IMHO it should be forwarded the same as one would forward the
INVITE. Dropping it is quite a hardliner approach :-)


Andrei



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