Grandstream UCM6510 User Manual - Manual (Page 248)

Firmware Version 1.0.2.5 UCM6510 IP PBX User Manual Page 247 of 313
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 81: UCM6510 Feature Codes] and [ENABLE SPY] section for instructions.