With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeEphoneDnDStatus
Cisco Call Manager Express Ephone Dn D Status
1.3.6.1.4.1.9.9.439.1.2.6.1.13
True indicates that phone is set do-not-disturb (DnD) on one or more of the phone's extensions used by the Cisco IP phone. False indicates no DnD is set.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeEphoneDnDStatus on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.