FaceTime freezes during call...

When using FaceTime,  it freezes, then returns to real time.   Is this just a buffering issue? 
If so, is there anything I can do to improve it?

I have a Cisco WRVS4400N WiFi router on both ends of my Facetime calls.
One is version 1.3 firmware the other is version 2
Version 1.3 router crashed EVERY SINGLE TIME I use face time.
Version 2 firmware does not crash.
I have done all of the recommended things like opening ports with no success.
I even located my Iphones under Settings / WiFi settings on the Iphone and put that IP address on DMZ (essentially putting the Iphone on the outside of the router firewall)
NOTHING FIXES THIS PROBLEM!
I have boiled this down to 3 possibilities.
1.  Iphone sends some commands through the router that cause it to hang.
2.  My ISP blocks my service when they see my Iphone FaceTime traffic (if they do that they are in BIG trouble)
3.  The router sends some data to the Iphone that makes it go berserk.
At a very minimum CISCO and Apple need to get on the phone with each other to sort this out. They are BOTH getting a black eye over this.
I am talking to my ISP to make sure they don't block Facetime traffic. BTW, most IPSs block outbound port 80 traffic. (Yeah, that's a dirty little secret. ISPs don't want you to host a website on your home service.)
Port 80 is the port where web traffic goes. (anything with a http:// in the address)
It did not happen until Ios 5.1

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