[asterisk-dev] Bug or not - "no reply to our critical packet" ?

[Klaus Darilion]

I guess that Asterisk sends 200 OK but does not receive ACK. This is the 
usual problem if call drops after 30 seconds.

IMO it is the correct behavior to drop the call if ACK is not received, 
becuase usually this is introduced by NAT problems and usually fi ACK is 
not sent to Asterisk, other important messages (like BYE ...) will also 
not make it through to Asterisk

use ngrep to debug your retransmission issues (sniff also on the SIP 
phone side)

regards
klaus

Serge Berney schrieb:
> Hello everybody !
> 
>  
> 
> Last day we experiment a communication drop with this error message :
> 
>  
> 
> [Mar 18 12:35:27] WARNING[3854]: chan_sip.c:1958 retrans_pkt: Maximum 
> retries exceeded on transmission 
> MzhjNTAyZjNiOTM4MGNjMGZhOGJmYmQ2ZjFlMWJhNzA. for seqno 2 (Critical 
> Response) -- See doc/sip-retransmit.txt.
> 
>  
> 
> [Mar 18 12:35:27] WARNING[3854]: chan_sip.c:1980 retrans_pkt: Hanging up 
> call MzhjNTAyZjNiOTM4MGNjMGZhOGJmYmQ2ZjFlMWJhNzA. - no reply to our 
> critical packet (see doc/sip-retransmit.txt).
> 
>  
> 
>  
> 
> I check on the web and see that long time ago, some user experiment had 
> same problem.
> 
> But I see also that, since version 1.4, this kind of error “no reply to 
> our critical packet” wasn’t considered as a Fatal error… So is it normal 
> that cause hang up ?
> 
>  
> 
> I’m running Asterisk 1.4.22 and communication was established between an 
> Aastra 55i and X-Light
> 
>  
> 
> Thanks for informations.
> 
>  
> 
>  
> 
> Serge BERNEY
> *Kin SA*
> www.kinonline.net <http://www.kinonline.net/>
> 
>  
> 
> 
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