>> Any ideas? I get the feeling I'm missing something obvious!
>
> Perhaps this could help:
>
> https://www.kamailio.org/docs/modules/5.5.x/modules/nathelper.html#nathelper.f.add_contact_alias

This involves adding additional data to the Contact URI which I want to avoid if possible.

Also, unless I misunderstand, it seems that the alias parameter is used to populate the $du which I can do effectively, it's the source that I'm having issues with or having it use an existing socket to that same destination.

Ross
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