Cannot Receive Incoming calls After Connecting Magic Jack

I just purchased a Magic Jack and hooked it up.  I was able to use the phone for outgoing calls minutes afterwards but have been unable to receive incoming calls.  After doing some research, it appears to be a problem with the Xfinity WiFi.  I've read several posts on here and there were a few that mentioned solutions.  One of which was to setup two port forwarding ranges, which I did, but still have the same problem.  Another mentioned a solution provided by an Xfinity Technicon, but no details of what that solution was.  Very frustrating...I'm reaching out hoping that there is a viable solution for this problem.  

A little extra information.  When I try to make a call to the number, there is no ring or indication that there is an incoming call on the caller ID, but I hear a ring on the phone I'm calling from.