I am not 100% sure I fully understand my issue, but I think I'm on the right track. I have a situation where Asterisk will drop calls a few seconds after they are set up. What I believe is happening:
a=asterisk k=kamailio
k --> INVITE --> a a --> 100 TRYING --> k a --> 183 RINGING --> k a --> 200 OK --> k k --> ACK -->a (this packet is never received by asterisk) a --> 200 OK (retransmit) -->k a --> 200 OK (retransmit) -->k a --> 200 OK (retransmit) -->k a --> no response to critical packet - terminating call
It doesn't appear that Kamailio is retransmitting the ACK. I would think that would be part of the TM module, but perhaps I am not using it properly. Is this possible or is there something else going on?
Thanks.
2010/6/21 Geoffrey Mina geoffreymina@gmail.com:
It doesn't appear that Kamailio is retransmitting the ACK. I would think that would be part of the TM module, but perhaps I am not using it properly. Is this possible or is there something else going on?
Are you using loose_route() in kamailio.cfg? In this case: has the destination phone a private address and kamailio is not fixing the "Contact" header of the 180/200 response from that phone?
Hi!
TM only handles retransmissions of single transaction.
The ACK is a new transaction, thus there won't be any retransmissions by tm. tm will forward the retransmitted 200 OK and the client should retransmit ACK.
Maybe you have a problem with NATs and the ACK is routing falsely. Take a look at the request URI of the ACK - it should contain Asterisk's IP address.
regards Klaus
Am 21.06.2010 15:12, schrieb Geoffrey Mina:
I am not 100% sure I fully understand my issue, but I think I'm on the right track. I have a situation where Asterisk will drop calls a few seconds after they are set up. What I believe is happening:
a=asterisk k=kamailio
k --> INVITE --> a a --> 100 TRYING --> k a --> 183 RINGING --> k a --> 200 OK --> k k --> ACK -->a (this packet is never received by asterisk) a --> 200 OK (retransmit) -->k a --> 200 OK (retransmit) -->k a --> 200 OK (retransmit) -->k a --> no response to critical packet - terminating call
It doesn't appear that Kamailio is retransmitting the ACK. I would think that would be part of the TM module, but perhaps I am not using it properly. Is this possible or is there something else going on?
Thanks.
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
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Geoffrey Mina -
Iñaki Baz Castillo -
Klaus Darilion