[USR-TC] Active Users by E1/T1

Hi Could you tell me what is the MIB for calculate the number of active sessions for every E1 or T1. In Cisco AccessServer, I found the MIB "cpmActiveUserID" (.1.3.6.1.4.1.9.10.19.1.3.1.1.3) . With this MIB, I can calculate the number of active sessions in every E1 (or T1). Thanks Esteban