The issue is that when the night service bell is activated and then deactivated on a 7970 phone, that phone's call forward option is automatically set to a strange number without the user actually doing anything. It only happens with a 7970, and it happens in at least three sites that have been tested, and presumably more. If customer uses another phone they do not see a problem. Customer has tried setting the phone's template to disable forwarding and that has no effect.
Please see attachment 7970.doc