With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpmActiveDS0sHighWaterMark
cpm Active DS0sHighWaterMark
1.3.6.1.4.1.9.10.19.1.1.8
The high water mark for number of DS0s that are active simultaneously
Back to CISCO-POP-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cpmActiveDS0sHighWaterMark 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.