When using the latest ALM (evaluation) software, version 3.2, problems might occur during the phone detection process in combination with a Cisco 7912 A.
A software-bug has been discovered within the firmware of the “old” Cisco CP-7912-A IP phones. This specific phone does not send the required CDP packets, ALM relies on these CDP packets during the detection process.
Cisco has canceled the support and development of the CP-7912-A phones. So to be able use ALM, when using these specific type of phones, do not use automatic phone detection but configure manual settings. ALM will work with manual detection settings.
For additional information from Cisco concerning service and support for this phone model consult the link below.