This issue typically occurs when the user is logged in using Extension Mobility (EM) or when using Force Authentication Code (FAC).
Perform these steps on the Cisco CallManager Admin page:
1. Go to CallManager Administration Page --> System --> Enterprise Parameters. Select CDR Parameters --> Cluster ID *
2. Choose StandAloneCluster If you have only one server. If you have more than one server, choose the name of the publisher server (CISCO-Cluster).
3. Verify that the Owner User ID option has a value assigned. Without a value assigned, you do not receive the CallingPartyLoginUserID and the finalCalledPartyLoginUserID fields in the report. A user ID must be assigned to each IP phone.