I am beginning to implement the new 7941 and 7970 phones on our network (currently have about 30 installed). I notice that every once in a while (not sure on the exact timing - maybe every two hours?) the phones go into "registering" mode. The phones are not being utilized yet - just for testing right now. Why are they doing this and how do I prevent them from doing this? It should not be a power issue or specific switch issue as this happens off of mulitple switches. Where do I look? Thanks.