I have Vonage, I am able to dial numbers in my own area code, but outside my area code, I get the busy tone. I have called Vonage and they have changed the packetization from 20ml seconds to 10ml seconds, but still I get the same problem. I ordered the fax line from Vonage and the same problem persists. I even tried a fax line with a different area code, but I still have the same problem not being able to dial any number outside my native line's area code.
I have been talking with technical support for both x10 and Vonage so many times once even three calling to both companies, but it all came to an incompatibility conclusion.
FYI...I have tried the x10 device on my neighbor's landline and it works just fine, dials outside area codes.
If you guys run across the same problem and manage to resolve it, please keep me posted.