If the 200-OK to client A also contains Record-Route header fields,
then the routing of the ACK from client A should be done using that
route, not using the internal IP address of asterisk.
Are you using record_route() function from the rr module?

James

On Wed, 26 Apr 2023 at 09:20, Péter Dr. Barabás
<dr.peter.bara...@gmail.com> wrote:
>
> Hi all,
>
>
>
> we are developing a softphone mobile application which registers to asterisk 
> through kamailio. Kamailo proxies the request to asterisk and replies from 
> asterisk to the clients.
>
> Registration works fine with asterisk authentication. The problem appears in 
> the following flow:
>
> Mobile client A calls client B.
> Asterisk gets INVITE through kamailo, sends back 401, and get INVITE with 
> credentials.
> Asterisk sends invite to client B towards kamailio.
> Kamailio forwards INVITE if client is registered or sends a push notification 
> to client B. When client B registers, kamailio continue the suspended 
> transaction and forwards INVITE.
> Client B gets INVITE, sends a SIP OK.
> Asterisk gets SIP OK through kamailio and sends an ACK to client B, which is 
> OK.
> Asterisk sends the SIP OK to client A through kamailio.
> Kamailio forwards SIP OK to client A but the contact address contains the 
> asterisk IP instead kamailio.
> Clilent A try to send ACK but it does not arrive to asterisk, and the call 
> will be hungup after 30 secs.
>
>
>
> So the question is what is missing, what is the correct solution? I try to 
> use the provided configuration given in following link:
>
> https://kb.asipto.com/asterisk:realtime:kamailio-4.0.x-asterisk-11.3.0-astdb
>
>
>
> The difference is that kamailio has no access to asterisk database.
>
>
>
> Thanks for your help.
>
>
>
> With kind regards,
>
> Peter
>
>
>
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