Do 7912G, CP-52x phones support paging and/or intercom?
Yes. Paging is configurable and supported by CCA. On single line IP phones such as 7912G and CP-521G, CCA disables intercom, so CLI configuration is required. The following is a sample configuration for enabling dialable intercom using overlay with 7912G. In the example below, anyone can dial 401 to activate intercom on the 7912G. For more details regarding parameters for intercom, please refer to the Cisco Unified Communications Manager Express System Administrator Guide.