We have a 7975 phone with a 7916 attached that was mistakenly setup as a dual line phone when it was installed. Once we discovered the error, we changed the phone to Octal Line in the CCA but even after a reboot the phone will still only handle 2 calls.
Below is the Show Ephone information for the phone (with the additional buttons removed)
ephone-2 Mac:E8BA.XXXX.XXXX TCP socket: activeLine:0 whisperLine:0 REGISTERED in SCCP ver 17/17 max_streams=5 (tapi Client in ver 9/9)
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...