[OpenSIPS-Users] Port changes

[Bogdan-Andrei Iancu]

Hi Schneur,

The ACK is routed back via the Route set (the Record Route headers from 
the initial Invite) and the Contact received in the final reply (in the 
200 OK in your case). This is called in-dialog routing and is 
exclusively based on Route set (RR headers + Contact).

The rport as part of via is used only for routing back the replies for a 
requests (in transaction routing) and has no impact on the in-dialog 
routing.

So, if the RURI in ACK (which should be the Contact in the received 200 
OK) is broken, maybe you should do a fix_nated_contact() for the Contact 
when handling the 200 OK reply.

Best regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   http://www.opensips-solutions.com
OpenSIPS Summit 2018
   http://www.opensips.org/events/Summit-2018Amsterdam

On 02/12/2018 05:05 PM, Schneur Rosenberg wrote:
> I have this interesting scenario, caller sends call to our OpenSIPS
> who actsd as a loadbalancer which sends the call to a gateway for
> termination and the gateway sets Session-Expires: 1800;refresher=uas,
> the caller sends call the call through port 1090 and the rport in the
> Via shows rport=1090 and so far everything is ok, but after 15 minutes
> the gateway sends a reinvite,  OpenSIPS sends it to the client and the
> client sends a OK and OpenSIPS properly sends the OK to the gateway,
> the gateway sends a ACK to OpenSIPS, but here the problem starts
> OpenSIPS sends the ACK to the port in the Contact header which is not
> the same port as the rport, the clients router does not recognize the
> packet and blocks it, the client sends multiple OK's to OpenSIPS who
> ignores it because he has already moved on, as far as OpenSIPS is
> concerned the ACK has already been sent to the next hop, and after
> approx 30 seconds the client does not receive the ACK and sends a BYE
> and the call terminates.
>
> Why is OpenSIPS changing the port to the Contact port? and what can I
> do to fix it?<div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br />
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