2 instances of my number

[usa2k]

I had issues trying this today, but had more success using port 5061.
I put in a help request for no outbound audio when getting an incoming call.
VOIPo support had a look and it all seems good now.

5061 was working good at one point and I may have complicated things by trying a few other ports. vPanel was stacked up with device registration lines. So it could have been my own problem.

Bottom line - all is good

The Grandstream is for in/out
The ZyXel is for out only if ever needed.
I route the in to the other phone port not connected. (ZyXel lets you decide which/both ports ring.)

Oh ... 123 for VM is working great from either line
(No Comedian Mail greeting!)

[usa2k]

The two instance of my same number have been working great.
(I had a network issue with my ethernet cable bypassing router to a switch.)

Anyway, the point is, it is working great. And, I recently noticed a DSLR thread about VT with this topic: http://www.viatalk.com/two_phone_lines.htm That nicely says what I've been saying all along.

I do not believe that VT is really your competition.
So what they do is probably just a passing interest.
I expect your real competition to be Packet8 and Vonage.