ccmeEphoneActivityStatus 1.3.6.1.4.1.9.9.439.1.2.6.1.4

Current status of the Cisco IP phone as seen on this device. onhook(1) - Phone is on-hook. offhook(2) - Phone is off-hook. ringing(3) - Phone is ringing. paging(4) - Phone is receiving an audio page.