[Serusers] T.38 Fax / NAT helper /rtpproxy

[jbarben at claritytel.com]

Hello SER users!

I am really struggling to get T.38 fax working when the UA (Sipura SPA 
2000) is behind a firewall.  My normal methods of employing nathelper 
and rtpproxy have proven fruitless.

I think one of the issues is that the receiving gateway sends a reinvite 
back to SER; two in fact.  I'm not sure I'm handling them properly.

Has anyone have a sample config that is working for this dilemna?  I'd 
sure appreciate a visual pointer or two.

Thanks,
Jac