[OpenSIPS-Users] ACK for invite with wrong Cseq

Bogdan-Andrei Iancu bogdan at opensips.org
Wed Feb 1 07:49:27 EST 2017

Hi Schneur,

Indeed, checking the in-dialog pinging code, I found that the pings 
_may_ be generated between 200OK and ACK. Could you open a bug request 
on GITHUT for this topic ?

Thanks and Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer

On 01/31/2017 01:54 PM, Schneur Rosenberg wrote:
> Hi, I'm using OpenSIPS 2.2.2 and I'm using create_dialog with the "Pp"
> options, most calls run fine, but I have got complaints about calls
> getting disconnected after about 30 seconds, I ran a trace and I
> realized that OpenSIPS sent a INVITE with CSeq 601, the called party
> picked up after approx 34 seconds and sent a OK with CSeq 601 which
> the gateway (Freeswitch in this instance) forwarded to OpenSIPS, but
> before OpenSIPS responded with a ACK it sent a ping Options to the
> gateway with CSeq 602 and the gateway replied with a OK, and then
> OpenSIPS sent the ACK for the INVITE  but used the CSeq of the Options
> 602 and not from the INVITE,601, therefore the gateway kept on sending
> OK's with CSeq 601 which OpenSIPS responded every time with the ACK
> but again with the CSeq 602. then after approx 30 seconds the gateway
> sent a bye with Reason: SIP;cause=408;text="ACK Timeout"
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