User's Manual Part 2

Firmware Version 1.0.0.1 UCM6200 Series IP PBX User Manual Page 260 of 320
Assume a call is on-going between extension A and extension B, user could dial the feature code from
extension C to listen on their call (*54 by default), whisper to one side (*55 by default), or barge into the call
(*56 by default). Then the user will be asked to enter the number to call, which should be either side of the
active call, extension A or B in this example.
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Caution:
“Enable Spy” allows any user to listen to any call by feature codes. This may result in the leakage of user
privacy.
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