With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
portsUsedLine8
ports Used Line8
1.3.6.1.4.1.351.110.5.1.1.1.1.10
Each bits set represents a DS0 that is used by all the logical ports defined so far for that DS1. The most significant byte is invalid for DS1. This is for line 8.
Back to CISCO-WAN-FR-PORT-MIB MIB page.
IPHost Network monitor allows you to monitor portsUsedLine8 on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.