With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alVersionMajor
ALTIGA Version Major
1.3.6.1.4.1.3076.2.1.2.1.1.1
The major release number of the VPN 3000 software. In the release identifier 1.4.2, the 1 is the major release number.
Back to ALTIGA-VERSION-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alVersionMajor on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.