Grandstream Networks GXW-4004 User Manual page 28

*87 Blind Transfer
Busy Call Forward: Dial "*90" and then the forwarding number followed by "#". Wait for dial
*90
tone then hang up.
Cancel Busy Call Forward: dial "*91". Wait for dial tone. Hang up.
*91
Delayed Call Forward: Dial "*92" and then the forwarding number followed by "#". Wait for
*92
dial tone then hang up.
Cancel Delayed Call Forward: Dial "*93" for a dial tone, then hang up.
*93
Flash/Hook
If user hears call waiting beep, flash/hook will switch to the new incoming call. Also used to
switch to a new channel for a new call.
# Pressing pound sign will serve as Re-Dial key.
FIRMWARE VERSION 1.0.9.1 GXW40XX USER MANUAL Page 28 of 60