[Asterisk-Users] Talking to other SIP hosts, wrong IP

[John Todd]

>On Mon, 2003-09-15 at 22:35, Shaun Ewing wrote:
>>  As per my problem yesterday with the Cisco 7960 and getting it talking to
>>  Asterisk on a different subnet, I gave up trying and just put the Asterisk
>>  box back on the internal subnet.
>>
>>  However, I made two changes:
>>
>>  - the external IP address is set on an ethernet alias eth0:0
>>  - the main Linux router will change outgoing requests from 10.1.1.2 to the
>>  external IP (rather than the default behaviour of NAT)  - this seems to work
>>  fine in testing.
>>
>>  However, I've been trying to register with FWD.
>>
>>  If I set the default gateway to be 10.1.0.1, Asterisk tries to register with
>>  "Contact: <sip:xxxxx at 10.1.1.2>" (xxxxx = FWD number). Naturally FWD doesn't
>>  like this.
>>
>>  If I set the default gateway to be the public IP, Asterisk tries to regster
>>  with "Contact: <sip:xxxxx at 127.0.0.1>".
>>
>>  Does anybody know of a way I can tell external SIP gateways that I'm
>>  @203.x.x.x whilst leaving the internal @10.1.1.2 ?
>
>	This is the same problem I have trying to register to a SER server
>while * was behind NAT.
>	I think if I found some spare time I´ll try to patch sip channel in
>order to register it´s internal IP address and then try the external.
>The idea is the same that Cisco ATAs uses, they register its own IP,
>when they receive the OK response most SIP servers add a
>"received=someip" where that someip is the IP address from they received
>the REGISTER request, normally our external IP address; so we unregister
>the first and register the external IP and change the Contact
>accordingly.
>
>--
>Juan J. Sierralta P. <juanjo at atmlab.utfsm.cl>
>UTFSM

There is already a feature request on the bugtracker for this - feel 
free to pick up the project!

http://bugs.digium.com/bug_view_page.php?bug_id=0000104

JT