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

[Greger V. Teigre]

> PS: What exactly does "record_route_preset()" do?  The docs don't say
> much other than "don't use this unless you know what you're doing."
>
> Registration is at least working (error above not withstanding) and I
> am not using that option, so I'm wondering if I truly need it.

It adds a Route header with the given IP address (and text). See the 
ONsip.org mediaproxy example config for an example.g
g-)