I'm trying to REGISTER on my SER server with the Grandstream Handy Tone but the Grandstream support STUN end when it register to my SER it register with the internal IP instead of the WAN. The Grandstream is behind a Linksys Cable/Router. I have about 20 Cisco ATA 186 with no problem... Any suggestion, does some body has any good script for the nathelper for this problem.....
Daniel