[Serusers] Retransmission problem

[Greger V. Teigre]

1. DON'T have UA2 and SER on the same server. You are very likely to get 
problems because SER sees it's own IP address in a message destined for UA2
2. Don't use t_newtran and t_forward_nonack_uri unless you know exactly 
what you do (and probably not then either)
3. When having problems like that, use a pretested Getting Started 
config fil (http://iptel.org/ser/doc/gettingstarted). If you still have 
the problem, there is something external (like UA2 on same box as SER). 
Fix it and then compare the logic of your config file with the Getting 
Started reference config
g-)

Zappasodi Daniele wrote:
> Hello, 
> I have a big problem with the retransmissions.
> In my tests sometimes the retransmission handler doesn't seem to work properly and it resends the INVITE after receiving a final response. 
> Moreover it doesn't respect the time-out (instead wait 1 second it resends the packet after few decimal), but this is a minor item.
>
> An example:
> INVITE sip:31203
> From 32201
>
> 	UA1(32201)  ---> SER ---> UA2(31203)	
> INVITE 	UA1 ---> SER ---> UA2	
> Trying	UA1 <--- SER
> 183		UA1 <--- SER <--- UA2
> 480		UA1 <--- SER <--- UA2
> ACK	 	UA1 ---> SER ---> UA2	
> ...
> Other call.
>
> After 0,5 msec SER sends again the first INVITE to UA2:
> INVITE 		SER ---> UA2	
> 183			SER <--- UA2
> etc.
>
> In the attached zipped file there are the syslog, the ser config file (only the relevant parts) and the ethereal captures related to this example.
>
>
> Some additional information:
> SER version is 0.9.2, compiled for arm.
> In my scenario SER and UA2 are on the same box.
> In LAN_capture.cap file there is the message flow between UA1 and SER, in lo_capture.cap between SER and UA2. 
>
> Can someone explain me this behaviour?
> Maybe something wrong in my config file? Note that I use t_lookup_request, t_newtran, t_forward_nonack_uri in order to recognize retransmitted INVITE, could it be here the problem?
>
> thanks
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