Which of the following devices is not supported by UCM’s call preservation feature?
A.
a Cisco IP phone
B.
an annunciator
C.
a transcoder
D.
a Cisco VG248 Analog Phone Gateway
Explanation:
Of the available choices, an annunciator is not supported by Cisco Unified Communications Manager’s (UCM’s)
call preservation feature. The call preservation feature enables some Voice over IP (VoIP) devices to continue
active sessions even if UCM fails or communication between UCM and the device is interrupted. An
annunciator is a Skinny Call Control Protocol (SCCP) device that can play recorded messages or tones to other
VoIP devices. Annunciators are often used to inform callers about the reason for a call’s failure.
Cisco IP phones, transcoders, and the Cisco VG248 Analog Phone Gateway are all supported by UCM’s call
preservation feature. When a UCM server fails, other UCM servers and supported devices in a cluster can
detect the failure. UCM is then able to ensure that active calls remain active until either the users hang up or
media stops streaming between the devices. Similarly, if UCM does not fail but loses connectivity to a device
that is involved in an active call, both UCM servers and connected devices will detect the failure. The active call
will remain active until the users end the call or media stops streaming between the devices.
When a supported device other than UCM fails, that device will no longer stream media. Thus the device is no
longer able to participate in its active call. However, UCM will detect this failure and any other devices that
might have been active on the same call will remain connected and active.Cisco: Device Support: Call Preservation