Two VoIP users and a mobile phone caller are participating in an active UCM call. No analog gateway is
present on the network. During the call, one of the UCM subscriber servers fails.
Which of the following will occur? (Select the best answer.)
A.
The mobile phone caller will be disconnected.
B.
All three users will be disconnected.
C.
All three users will remain active on the call.
D.
The two VoIP users will be disconnected.
Explanation:
The mobile phone caller will be disconnected because mobile phones, which place calls through the public
switched telephone network (PSTN), are not supported by the Cisco Unified Communications Manager (UCM)
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.
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.https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_0_1/ccmsys/accm-801-cm/
a02dvsup.html#wp1020706