Grandstream Networks HT812 User Manual page 27

Busy Call Forward: Dial "*90" and then the forwarding number followed by "#". Wait for dial
*90
tone then hang up.
Cancel Busy Call Forward. To cancel "Busy Call Forward", dial "*91", wait for dial tone, then
*91
hang up.
Delayed Call Forward. Dial "*92" and then the forwarding number followed by "#". Wait for
*92
dial tone then hang up.
Cancel Delayed Call Forward. To cancel Delayed Call Forward, dial "*93", wait for dial tone,
*93
then hang up
Flash/ Toggles between active call and incoming call (call waiting tone). If not in conversation,
Hook flash/hook will switch to a new channel for a new call.
Pressing pound sign will serve as Re-Dial key.
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HT812/HT814 User Guide
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