Grandstream Networks UCM6510 User Manual page 274

In the "Monitor" dialog, configure the following to monitor an active call:
1. Enter an available extension for "Monitor's Extension" which will be used to monitor the active call.
2. "Monitored Extension" must be one of the parties in the active call to be monitored.
3. Select spy mode. There are three options in "Spy Mode".

Listen
In "Listen" mode, the extension monitoring the call can hear both parties in the active call but the
audio of the user on this extension will not be heard by either party in the monitored active call.

Whisper
In "Whisper" mode, the extension monitoring the call can hear both parties in the active call. The
user on this extension can only talk to the selected monitored extension and he/she will not be
heard by the other party in the active call. This can be usually used to supervise calls.

Barge
In "Barge" mode, the extension monitoring the call can talk to both parties in the active call. The
call will be established similar to three-way conference.
4. Enable or disable "Require Confirmation" option. If enabled, the confirmation of the invited monitor's
extension is required before the active call can be monitored. This option can be used to avoid adding
participant who has auto-answer configured or call forwarded to voicemail.
5. Click on "Add". An INVITE will be sent to the monitor's extension. The monitor can answer the call and
start monitoring. If "Require Confirmation" is enabled, the user will be asked to confirm to monitor the
call.
Another way to monitor active calls is to dial the corresponding feature codes from an extension. Please
refer to
[Table 85: UCM6510 Feature Codes]
and section for instructions.
[Enable Spy]
UCM6510 IP PBX User Manual
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