With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mgEndpointLineNumber
mg Endpoint Line Number
1.3.6.1.4.1.351.150.10.1.3.1.1.2
Identifies the DS1 line. Generally, this will correspond to the ifIndex of the physical interface terminating the line. Once the row has become active, this value may not be changed.
Back to CISCO-WAN-MG-MIB MIB page.
IPHost Network monitor allows you to monitor mgEndpointLineNumber on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.