There is dependency on security settings in configuration file that the phone gets from BE3K. Since BE3K does not support any signaling or media encryption technology, the phone do not get this setting enabled in the cosnfiguration. Hence it does not initiate any request with encryption parameters in the signaling message.
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...