Hi, Alexander, I think, I know, what is the cause. In two words - it is 7912's bug.
Here is my analysis. Ack message must be sent to URI, specified in Contact field of 200Ok message. See normal call in your cid.xml file, frames 640 (packet no.29) and 641 (packet no 30). Request line of frame 641 is ACK sip:[email protected]:5090;sipXecs-CallDest=LD SIP/2.0 Note port 5090, that is sipxbridge. Now lets see at frames 679 (packet no. 68), 680 (packet no. 69). 7912 gets the following conact in the 200OK (frame 679) Contact: <sip:[email protected]:5090> - sipxbridge. But 7912 then sends Ack to (Request URI): ACK sip:[email protected];user=phone SIP/2.0 That is to sipxproxy. Sipxproxy, naturally, sends this request further, adding a Via header. But "further" is to sipxproxy itself. Thus the Ack is looped inside sipxproxy until Max-Forwards header is counted down to 0. Rgds, Nikolay. > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > ????????? ???????? > Sent: Tuesday, September 28, 2010 11:57 AM > To: sipx-users > Subject: [sipx-users] sip trunk works but cisco 7912 can not > call through it(sip guru welcome) > > sipxecs 4.2.1 + sip trunk (nat) to itsp + (Cisco 7911, 7940, Linksys > SPA922) and everything works. Phones can call each other > locally, inside and outside and there are two way audio. > > But there is bunch of Cisco 7912 (Software > Version8.0.1(060412A) ) which cannot call out through the > trunk. Please see cid.xml at http://golex.nsk.ru/ There are > three call there. > 1. Usual call from Cisco 7940 (10.0.20.253 ext 9040) 2. Bad > call from Cisco 7912 (10.0.20.252 ext 9012) with a lot of > strange ACK packets. > 3. Normal call from outside to AA transfered to 9012 extension. > > Is it wrong configuration or bug? > > -- > Alexander > _______________________________________________ > sipx-users mailing list > [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-users/ _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users/
