With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
faVJCompressionUnavailable
fa VJ Compression Unavailable
1.3.6.1.2.1.44.1.5.3.11
Total number of Registration Requests denied by foreign agent -- requested Van Jacobson header compression unavailable (Code 73).
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IPHost Network monitor allows you to monitor faVJCompressionUnavailable 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.