With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdsmrResultIpRemoteIpAddress
Cisco Distributed Short Message Routing Result Ip Remote Ip Address
1.3.6.1.4.1.9.9.1300.1.4.1.4
This object contains the remote IP address allowed to request the session.
Back to CISCO-ITP-DSMR-MIB MIB page.
IPHost Network monitor allows you to monitor cdsmrResultIpRemoteIpAddress 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.