With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdsmrInstResourceErrors
Cisco Distributed Short Message Routing Inst Resource Errors
1.3.6.1.4.1.9.9.1300.1.2.1.16
Count of the number of times processing of packet was not completed due to unavailable resources on device.
Back to CISCO-ITP-DSMR-MIB MIB page.
IPHost Network monitor allows you to monitor cdsmrInstResourceErrors on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.