asterisk users - Oct 2012 - RTP IP re-write

I am having a problem trying to get a particular softphone working on my 
setup.

The machine it runs on has more than one interface. When the softphone 
registers, it registers fine, and asterisk is given the correct IP for 
registration.

Whenever RTP is set-up however, the client gives the wrong IP to connect 
to and I get the inevitable problem with one-way media.

Is there any way of forcing that SIP account to have the rtp always sent 
to a particular IP. (I know that this still may not work, because the 
device is probably listening on the wrong interface as well, but it's 
worth a try).

I haven't been able to get a response from the vendor of the softphone.

Thomas Kenyon wrote:
> I am having a problem trying to get a particular softphone working on my
> setup.
>
> The machine it runs on has more than one interface. When the softphone
> registers, it registers fine, and asterisk is given the correct IP for
> registration.
>
> Whenever RTP is set-up however, the client gives the wrong IP to connect
> to and I get the inevitable problem with one-way media.
>
> Is there any way of forcing that SIP account to have the rtp always sent
> to a particular IP. (I know that this still may not work, because the
> device is probably listening on the wrong interface as well, but it's
> worth a try).
It's not possible to do this as you describe but if you set
"nat=yes"
the RTP module will lock on to the source of the incoming media after a 
certain number of packets. This does require that the softphone send 
packets to Asterisk and that they make it, of course.

Cheers,

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at:  www.digium.com  & www.asterisk.org