[reSIProcate] Setting via headers for STUN

[Jason Fischl]

>
>
> I think you will find some resistance to making this the default behavior.
> Please consider doing this locally only or we should have a fairly open
> discussion around this. I fear other list members will object. I object
> mildly - we have had a general philosophy of not doing things in reSIProcate
> that are against the standard. At the same time, the stack should provide
> enough flexibility for a local user to do what every they like with the
> stack.
>

I'll kick in my opinion that we should NOT do this approach by default
in the stack.