[SR-Users] How do deal with a lost ACK and TM
Klaus Darilion
klaus.mailinglists at pernau.at
Mon Jun 21 15:37:43 CEST 2010
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.
>
>
>
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