With IPHost Network Monitor you can run simple snmp requests against a ADTRAN device in your network.
adGenAOSnmTwLocalSyncState
Adtran Gen AOS Network Monitor Tw Local Sync State
1.3.6.1.4.1.664.5.53.2.2.6.1.5
If return value is true, local clock is in sync.
Back to ADTRAN-AOS-NETWORKMONITOR MIB page.
IPHost Network monitor allows you to monitor adGenAOSnmTwLocalSyncState on ADTRAN device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring ADTRAN IP phones right now.