[SR-Users] CANCEL message processing

Stephen Dodge (Bistech) Special.Projects at bistech.co.uk
Fri Mar 30 17:17:42 CEST 2012


Hi Guys,

I have a question regarding the correct processing for cancelled requests

1. (A)--------------------INVITE ------------------->(B)
2. (A)<------------------180 RIGING------------------(B)
3. (A)--------------------CANCEL-------------------->(B)
4. (A)<------------------OK--------------------------(B)
5. (A)<---------487 Request Terminated---------------(B)
6. (A)--------------------ACK----------------------->(B)

I have the following section to deal with cancel messages however I am finding that the 487 response still hits my failure_route block.    The failure_route block is called for serial forking.

# CANCEL processing
if (is_method("CANCEL"))
         {
                 if (t_check_trans())
                         xdbg("## BISNET ## - Cancel Processing\n");
                         t_relay();
                exit;
         }

I can obviously do something like a (!t_check_status("487")) within the failure block but is there a better way to deal with this response ?

Although this doesn't really cause me a problem at the moment I see the following error in the debug

/usr/sbin/kamailio[23786]: ERROR: tm [tm.c:1368]: ERROR: w_t_relay_to: t_relay_to failed
/usr/sbin/kamailio[23786]: ERROR: sl [sl_funcs.c:282]: ERROR: sl_reply_error used: transaction canceled (487/SL)


As always your help is appreciated.

Steve



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