Check manual page of cisco_srst_state
Cisco Unified Survivable Remote Site Telephony (SRST): Status
This check monitors the status of the Cisco Unified SRST feature
of a Cisco device which supports that feature.
There are two possible states: active CRIT or inactive OK.
Moreover the check displays the time (in minutes) since the SRST feature
switched to active mode.
One service is created for each device.