Grandstream GXP1100 User Manual - Manual (Page 26)

FIRMWARE VERSION 1.0.8.4 GXP1100/GXP1105 USER MANUAL Page 24 of 53
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The call will hang up automatically with delayed call forward set up.
*93
Cancel Delayed Call Forward. To cancel the delayed call forward:

Pick up the handset;

Dial *93. A short tone will be heard;

Wait for the call to hang up. The delayed call forward is cancelled.