I think we have solved our routing problems with the 881s but, still we are seeing phones hanging off them start registering, seemingly randomly, but one user explained that it seems to happen to him when he opens outlook. Wondering if the application could be taking all the Comcast bandwidth momentarily making the phone re-register. We have configured qos. The same user said that sometimes during the day when he is talking it will start re-registering again. His phone call will not drop though. He said that when his phone is registering during a phone call he won't drop the call but, he loses all his phone functions during the time it is registering. Has anyone else experienced this? Is this normal behavior? Any suggestions on how to remedy?