Is there an OID for SNMP to give a userlist of connected users on RASExpress?

UserName for all lines is available with the following variable :
serLineStatisticsLineUserName (1.3.6.1.4.1.995.2.30.13.1.7.<ifindex>)

There is another call history table entry which gives for all lines,
last few calls : serCallHistoryUserName
(1.3.6.1.4.1.995.2.30.16.1.3.<ifindex>.<historyindex>)