I have a mics 5.0 with 4.0 nam. I have set the call forward to the vm port and set to 4 rings. When i call the did assigned to a phone, after 4 rings it goes to the main greeting and not to the persons personal voice mail box. If i lower the cfna number of rings to 3 or 2 it rings that many time and then to the main greeting of the office. I have a night ring button on the main set. i am not sure where to go at this point.. any suggestions??