With IPHost Network Monitor you can run simple snmp requests against a ADTRAN device in your network.
adUnitUserState
ad Unit User State
1.3.6.1.4.1.664.5.30.2.2.1.1.8
Indication of whether or not the user has an active session.
Back to ADTRAN-ADUNIT-MIB MIB page.
IPHost Network monitor allows you to monitor adUnitUserState on ADTRAN device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring ADTRAN routers right now.