Grandstream Networks GXV3275 User Manual page 85

Force Audio Calling (per call)
*83
Force Video Calling (per call)
*84
Busy Call Forward. To set up busy call forward:
*90
Cancel Busy Call Forward. To cancel the busy call forward:
*91
Delayed Call Forward. To set up delayed call forward:
*92
Cancel Delayed Call Forward. To cancel the delayed call forward:
*93
Firmware Version 1.0.3.6

Dial *83 followed by the phone number to send the audio call.

Dial *84 followed by the phone number to send the video call.

Dial *90 followed by the phone number to forward the call.

Dial *91.

Dial *92 followed by the number to forward the call. The default timeout
before the call is forwarded is 20 seconds.

Dial *93.
GXV3275 User Guide Page 83 of 167