I am trying to get an AVAYA doorphone to work on a 4620 IP phone. The problem is the keypad on the IP phone is not active after you answer the door phone so you cannot key in the ** code to open the door. It works if the doorphone rings to an analog phone. On the 302 console there is a feature dont-split which allowed the operator to use the keypad but that feature is not available on the IP Phone. Any ideas. Thanks.