With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeAlertTimeout
Cisco Call Manager Express Alert Timeout
1.3.6.1.4.1.9.9.439.1.1.42
Indicates the length of time interval for which Cisco CallManager Express allows the IP phone to alert (ring) if a call is not answered.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeAlertTimeout on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.