Discovering IP phones as end hosts is the first step. If that's working, that means the CAM/MAC tables are populated correctly, and UT is acquiring that data. The next step is to verify that the CCM(s) that know about those phones show up as green on the Topology Map. If they do, snmpwalk the ccmPhoneTable on those CCM(s) from the CiscoWorks server. You need to see the MAC address of the IP phones that show up in your UT hosts table.
If you do see those MAC addresses, enable vmpsadmin debugging under Campus Manager > Administration > Data Collection > Debugging Options, and perform another UT major acquisition. Since that log can be quite large, open a TAC service request, and include the log as well as a MAC from one of the missing phones.
If you do not see the CCMs on the Topology Map, or they are not green, check your SNMP settings in DCR as well as your Campus Manager Data Collection filters to make sure the CCMs can be properly data collected.
If the phones do not show up in the ccmPhoneTable, either those phones are not registered with that particular CCM, or there is a CCM bug.
