With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
isdnBearerCallOrigin
isdn Bearer Call Origin
1.3.6.1.2.1.10.20.1.2.1.1.6
The call origin for the current or last call. If since system startup there was no call on this interface, this object has a value of unknown(1).
Back to ISDN-MIB MIB page.
IPHost Network monitor allows you to monitor isdnBearerCallOrigin on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.