Door entry systems are usually trigged off an FXS port coming from the UC. The user would call the ext of the FXS port to trigger the door system. You may need to add some equipment to interpret this signal to work in conjunction with your 2N system to accomplish this goal.
Configure Multicast Paging on the Cisco IP Phone 7800 Series or 8800 Series Multiplatform Phone
The Cisco IP Phone 7800 and 8800 Series Multiplatform Phones provide voice communication over an Internet Protocol (IP) network...
Add Call Park on a Cisco 7800 or 8800 Series Multiplatform Phone Key Expansion Module
Call park allows the user of the phone to put an incoming call on hold so that the call can be retrieved on another phone. A call is park...