[SR-Users] Kamailio with Blox SBC (opensips based) - Wrong CSeq

[Fred Posner]

On 06/22/2015 10:30 AM, kai.ohnacker at cbc.de wrote:
> Hello,
> 
> my setup is a kamailio server as registrar and Blox as SBC.
> 
> Blox is a freeware GUI with Opensips as framework.
> 
> Kamailio is located in the private network and Blox operates with 2 NICs
> (private and public)
> 
> Now the following problem:
> 
> If I make a call from public (phonerlite) to private (mayah), the
> connection don’t reach the “framed” state and is “broken” after 30 sec.
> 
> After evaluating the log files, I found that the CSeq from Kamailio is
> wrong.
> 
> The invite comes from
> 
> CSeq: 9 INVITE
> 
> The reply is with CSeq 1
> 
> SIP/2.0 180 Ringing
> Via: SIP/2.0/UDP 192.168.0.3:6060;branch=z9hG4bK38ae.cf317344.0
> Max-Forwards: 70
> To: <sip:1001 at 192.168.1.3:8000>;tag=qTKGZvr0ItW
> From: "PhonerLite" <sip:1000 at 192.168.1.3:8000>;tag=1005520878
> Call-ID:
> SBCbFgsQn5HcHpEUxJUVF8gQWVZREt6QwJvWVJkXCdAUzdkXl41CUJ4cEdWZV1NQ0tFYQ
> CSeq: 1
> Contact: <sip:1001 at 192.168.0.33:5060>
> Record-Route: <sip:192.168.0.1;lr=on>
> User-Agent: MAYAH 4.9.12.0-2.1.0.45
> Content-Length: 0
> 
> And here the information from the opensips log files:
> 
>                 Jun 22 14:30:32 localhost blox-0-9-6-beta[1975]:
> ERROR:core:parse_cseq: no method found
> 
> Jun 22 14:30:32 localhost blox-0-9-6-beta[1975]: ERROR:core:parse_cseq:
> bad cseq
> 
> Jun 22 14:30:32 localhost blox-0-9-6-beta[1975]:
> ERROR:core:get_hdr_field: bad cseq
> 
> Perhaps someone of you knows this failure or can tell me how to solve
> this problem?
> 
> Cheers,
> 
> Kai
> 
> 

Perhaps you have an ngrep of the sip traffic?

--fred