With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdsmrInstBlockedPackets
Cisco Distributed Short Message Routing Inst Blocked Packets
1.3.6.1.4.1.9.9.1300.1.2.1.21
Count of the number of times packets were blocked by processing.
Back to CISCO-ITP-DSMR-MIB MIB page.
IPHost Network monitor allows you to monitor cdsmrInstBlockedPackets 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.