I am having the same problem with an Audiocodes MP118. I followed the guide, but my firmware seems to be quite different than the one listed. I did my best following along, but I don't seem to be making any headway. After about 6 hours of flip flopping settings, I am burnt out. I keep getting errors like [CM505001, CM505002] Device Not Idendified User Agent not Matched, and so on. For some odd reason, I can see in the log that the device seems to be putting the extension number in place of the proxy port ex: extension 101 it parses to look like: 192.168.1.101 <- where this replaces the actual IP of the Gateway.
I have not yet purchased this system, and after almost 3 days of testing, I have not gotten a configuration to work properly. One problem after another. I REALLY want to make this work, I DON"T want to go back to Traxhbox...,
Thanks,
BoB