Grandstream Networks GXP16 Series User Manual page 16

To dial phone numbers.
Press numeric keys "0-9" to enter phone numbers.
Standard Keypad
Press "*" to enter voice menu or input special characters or long press it to lock the keypad.
Press "#" to dial out numbers or input special characters.
Navigation Keys.
When entered the menu:
Press the UP/DOWN keys to scroll through menu options.
Press the LEFT key to go back to the previous menu.
The RIGHT key has no function.
In Idle:
Press the UP key to view missed calls.
Press the DOWN key to view dialed calls.
Press the RIGHT key to view answered calls.
Menu/OK Key.
In Idle:
Press to enter the main menu.
Confirm the current selection or the inputted info.
Off hook:
Switch between outgoing call and paging call.
Mute.
To mute/unmute an active call.
When DND is on: Enable/disable DND when the phone is in idle.
Headset.
Press to switch between headset and handset mode in an active call.
Transfer.
Transfer an active call to another number.
Conference.
Establish 3-way conference with other 2 parties.
Send.
Send. Enter the digits and then press Send to dial out.
Redial. Redial when there is a previously dialed call.