Hi all -- We're using SER as a registrar and proxy, and need to deal with the following NAT problem: * SER is proxying to asterisk, which is behind a firewall. * Our users are registering with SER, but their UAs are behind another firewall. We're looking at nathelper and rtpproxy. Two questions: * Will this combo (SER, nathelper, rtpproxy) work in this scenario to solve the NAT and pinhole issues? * Does SER have to live outside the firewall, or is there a way it can be behind the same firewall as Asterisk? Thanks for any insight, Richard