Grandstream Networks GXP1610 User Manual page 37

*73
*90
*91
*92
*93
Note:
If the following feature codes don't work on your phone, please contact Administrator to turn on the Enable
Call Features on phone's Web GUI. Enable Call Features is under phone's Web GUI->Account->Call
Settings tab.

Dial out.

Note: Once set, all calls will be forwarded to another preset
number and your phone will not ring.
Cancel Unconditional Call Forward. To cancel the unconditional call
forward:

Dial *73.
Busy Call Forward. To set up busy call forward:

Dial *90 and then enter the number to forward the call;

Dial out.
Cancel Busy Call Forward. To cancel the busy call forward:

Dial *91;
Delayed Call Forward. To set up delayed call forward:

Dial *92 and then enter the number to forward the call;

Dial out.
Cancel Delayed Call Forward. To cancel the delayed call forward:

Dial *93.

Note: Once set, the incoming call will be forwarded to another
preset number if no one answers the phone.
GXP1610/GXP1620/GXP1625/GXP1628/GXP1630 User Guide Page 36 of 42