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@192.168.1.3:8000>;tag=qTKGZvr0ItW

From: "PhonerLite" <sip:1000@192.168.1.3:8000>;tag=1005520878

Call-ID: SBCbFgsQn5HcHpEUxJUVF8gQWVZREt6QwJvWVJkXCdAUzdkXl41CUJ4cEdWZV1NQ0tFYQ

CSeq: 1

Contact: <sip:1001@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