In my opinion, having a telecom background is much better than an IT background. I have found that someone with telecom can pick up the IP side much quicker than the reverse.
The big problem is understanding signaling. Most IT people cannot grasp the concept of signaling on lines like ISDN, Wink, etc., since there is no signaling like this in IP. Once you understand signaling, the rest is simple.
have you noted that SIP is liked mostly by people who come to the VoIP world from the “IP” side, not from the “telecom” side. The main reason is – they are afraid of the Q.931 side of the H.323.
If you are only getting one way audio, the most common reason for this is a firewall blocking the voice port or your ISP may be blocking the voice port.
I would suggest you forward all ports (put the Tenor in the full DMZ) as this will be the easiest. Otherwise you can go to Quintum’s web site to get a list of ports and try that, but I really do suggest opening all ports.
So you have the same router and router config with Tenor in the DMZ and on the old IP network it worked fine, but now you have a new IP network where no calls get voice?