Grandstream Networks HT503 - Configuration Guide; Configuring HT503 Through Voice Prompt; Configuring HT503 with Web Browser

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HT503 User Manual
“#”. Wait for dial tone and hang up. (dial tone indicates successful forward)
*73
Cancel Unconditional Call Forward. To cancel “Unconditional Call Forward”, dial “*73”,
wait for dial tone, then hang up.
*78
Enable Do Not Disturb (DND): When enabled all incoming calls are rejected.
*79
Disable Do Not Disturb (DND): When disabled, incoming calls are accepted.
*87
Blind Transfer
*90
Busy Call Forward: Dial “*90” and then the forwarding number followed by “#”. Wait
for dial tone then hang up.
*91
Cancel Busy Call Forward. To cancel “Busy Call Forward”, dial “*91”, wait for dial tone,
then hang up.
*92
Delayed Call Forward. Dial “*92” and then the forwarding number followed by “#”. Wait
for dial tone then hang up.
*93
Cancel Delayed Call Forward. To cancel Delayed Call Forward, dial “*93”, wait for dial
tone, then hang up.
Flash/Hook
Toggles between active call and incoming call (call waiting tone). If not in conversation,
flash/hook will switch to a new channel for a new call.
#
Pressing pound sign will serve as Re-Dial key.