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

[kai.ohnacker at cbc.de]

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
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