asterisk users - Sep 2003 - Talking to other SIP hosts, wrong IP

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@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@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 ?

-Shaun

I upgraded my 7960 firmware to ver 4.4.  I now can't make any calls and
I get errors "(retrans_packet) on call" on the console maximum retries
exceeded.  And ideas?

Thanks

Kevin

I have implemented a work around for now.

Compiled and installed Asterisk on the gateway (which will only be used for
talking externally).

Setup an IAX link between the main Asterisk box and gateway Asterisk.

All works perfectly. This is probably the most secure solution anyway,
rather than allowing external access to my main Asterisk box.

-Shaun

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@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@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@atmlab.utfsm.cl>
UTFSM

I upgraded my 7960 firmware to ver 4.4.  I now can't make any calls and
I get errors "(retrans_packet) on call" on the console maximum retries
exceeded.  And ideas?

Thanks

Kevin