[OpenSER-Users] port modification is sdp

[Bogdan-Andrei Iancu]

Hi Kostas,

If you want to change only the port, try the mangle module:
    http://www.openser.org/docs/modules/1.2.x/mangler.html#AEN99

Regards,
Bogdan

Konstantinos Koutsopoulos wrote:
> Hi,
>
> I am deploying openser 1.2.2-notls on a machine with public IP.
> On the same machine I run a sip client (A) that registers with the
> above openser.
>
> On an another machine behind NAT (typical adsl router) I use a sip 
> client (B)
> to register with the above openser and try to invite sip client A.
>
> I do not use any NAT-traversal techniques (the outgoing packets from
> B are modified by NAT and reach openser, responses are received by
> B through NAT due to statefull (?) routing on the NAT).
>
> The SIP messages reach their destination properly and moreover
> the IP addresses in the SDP (from B) are updated by openser
> to indicate the external interface of NAT. This is very useful in
> my case since the client A sends the media packets to the proper
> address (I also configure virtual servers on the adsl router to have
> these forwarded to B). However, the port numbers in the SDP are
> also updated (usually by an offset of +16) which hinders the media session
> from A to B since B is expecting the packets on other ports.
>
> Is there any way to have the ports remain unaltered during the above 
> operation?
>
> Thanks in advance,
>
> Kostas
>
>