Iñaki, Thank You for clearing a few things up. Yes You are absolutely right with all signalization aspect, but transaction identifier inspection really makes me think and again i see that there are a lot aspects i need to take care of. Could you pls point me to some hints describing the proper way to build transaction inspection?
Thanks, Maciej. >> The call is generated by UA registered with Opensips, then t_relayed >> to OPERATOR_1 and his MGW to PSTN. >> UA------>OPENSIPS----->OPERATOR_1_SIPPROXY-------->MGW >> >> The proper call flow should be (A) is UA, B is OPERATOR_1_SIPPROXY >> 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) >> and it looks the same, but: >> >> - CANCEL should be sent by (A) without To tag >> - OK should be sent by (B) with To tag >> - 487 with the same To tag > > Wrong. 200 OK for CANCEL is sent by the proxy (CANCEL is hop by hop). > However 487 is sent by the UAS (not by the proxy) and of course the > UAS doesn't know which To tag has chosen the proxy for the 200 > (CANCEL). Also, there could be multiple UAS's (parallel forking). > >> - ACK should be sent by (A) with exactly the same To tag. > > Just a final 487 will be delivered by the proxy to the UAC (even in > case there is parallel forking) so the ACK must contain the same Totag > than the 487 received. > > >> Unfortunately it is not my case :( >> - I am fine with CANCEL >> - I am receiving proper OK with To tag >> - and here is the source of my problem. 487 is sent by (B) without >> totag proposed in OK message previously sent. > > And that is correct. > > >> - ACK is obviously using the same totag as OK, > > That is wrong. It should be the same Totag as the UAC receives in the 487. > > >> so im my case no totag is incorporated into ACK method. > >> The after-effect is that ACK is asked for proxy auth. > > The proxy should not be dialog aware (Totag value aware). It should > inspect just the transaction identifier (Via's branch and CSeq). > > > -- > Iñaki Baz Castillo > <i...@aliax.net> > > _______________________________________________ > Users mailing list > Users@lists.opensips.org > http://lists.opensips.org/cgi-bin/mailman/listinfo/users > _______________________________________________ Users mailing list Users@lists.opensips.org http://lists.opensips.org/cgi-bin/mailman/listinfo/users