Just thinking out loud that I have seen the 9951 and 9971 models & will both support Video CAM option when plugged into an 802.3af POE port since they will draw approximately 12 Watts of power, but the sidecar for these phones will want another 5W so will exceed the af and we would have to have support for 802.3at POE or something higher than af.
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...