[OpenSIPS-Users] Strange ACK between OpenSIPS and Kamailio

[Ben Newlin]

The Contact fields in messages sent from different User Agents are not expected to be the same. The Contact header provides a URL which can be used to contact the UA about the dialog. If UAs were sending the same Contact as other UAs, they would be directing future requests to a different server.

It is the Request URI of the ACK that should match the Contact from the 200 OK. The ACK is not required to have a Contact at all, as the UAC’s Contact was already provided in the INVITE.

Ben Newlin

From: Users <users-bounces at lists.opensips.org> on behalf of Social Boh <social at bohboh.info>
Date: Thursday, November 9, 2023 at 9:16 AM
To: OpenSIPS users mailling list <users at lists.opensips.org>
Subject: [OpenSIPS-Users] Strange ACK between OpenSIPS and Kamailio
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________________________________

Hello list,

I have a problem in communication between an OpenSIPs and a Kamailio. The call comes from OpenSIPs to Kamailio, it is answered but the ACK that OpenSIPs sends to Kamailio I think is not correct:

200OK from Kamailio to OpenSIPs: Contact: <sip:194.195.XXX.XXX:49999><sip:194.195.XXX.XXX:49999>

ACK from OpenSIPs to Kamailio: Contact: <sip:user at 177.242.XXX.XXX;did=86a.799c1654><sip:user at 177.242.XXX.XXX;did=86a.799c1654>

I think the ACK Contact Header from OpenSIPs to Kamailio should have the same 200 OK content

194.195.XXX.XXX is a Asterisk PBX

177.242.XXX.XXX is OpenSIPs

Result Kamailio don't send ACK to Asterisk PBX and the call ends about 30 seconds.

Any hint, please?

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I'm SoCIaL, MayBe
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