[Serusers] How to rewrite source IP -- SIP packet forwarding.

[Greger V. Teigre]

See my post yesterday to Alan on running SER behind a NAT, the same (at 
least) applies. You may also look at advertised_address and advertised_port.
g-)

Ray Van Dolson wrote:
> I'm using nathelper with SER.  Here's a quickie diagram of my
> setup:
>
>  [SIP ATA] <-------------> [SER] <------------------> [Asterisk]
> 10.0.201.5            eth1 - 10.0.201.7          eth0 - <public_ip1>
>                       eth0 - <public_ip0>
>
> I'm using the basic nathelper example configuration, except for one
> modification.  I removed the call to t_relay and replaced it with:
>
> t_relay_to("<public_ip1>", "5060");
>
> Basically I want a SIP packet to come in to eth1 on SER server, get
> rewritten as needed by nathelper, then get sent out to public_ip1 on
> my Asterisk PBX.
>
> This appears to be working except a tcpdump on eth0 on SER shows:
>
> 14:39:08.654908 IP 10.0.201.7.5060 > <public_ip1>.5060: UDP, length
> 629
>
> Obviously the packets will never get back with that source IP
> address.  What command should I be looking at to rewrite this IP so
> it shows up as <public_ip0> automatically?
>
> I'm trying to get SIP ATA's to REGISTER on my Asterisk box but proxy
> through SER ... (and eventually make use of the rtp proxy).
>
> Can post more info if requested, I am new to SER. :-)