A typical monitoring task for an E1/T1 access server is to monitor E1/T1 usage as a number of active DS0 channels in use per device or per particular DS1 channel on the device.

Use the url below which explains how to get the channel usage on a device:

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a00801abe59.shtml

Use the url below to configure the snmp service on the router which will help in obtaining the channel usage:

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094a05.shtml