With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
isdnMibEndpointGroup
isdn Mib Endpoint Group
1.3.6.1.2.1.10.20.3.2.4
A collection of objects describing Terminal Endpoints.
Back to ISDN-MIB MIB page.
IPHost Network monitor allows you to monitor isdnMibEndpointGroup 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.