Grandstream GXP1620 1625 IP Phone Quick User Guide

Grandstream GXP1620 1625 IP Phone Quick User Guide

Grandstream GXP 1620/1625 IP Phone

Quick User Guide

Basic Phone Operation





  1. Use the  Speaker Button to turn speaker ON/OFF.
  2. Use the  Headset button to use the headset once it had been connected.  


  1. Take Handset/Headset off-hook or press Speaker button or an available LINE key (activates speakerphone). 
  2. The line will have dial tone and the corresponding line’s LED will turn green. 
  3. If you wish, select another LINE key (alternative SIP account). 
  4. Enter the phone number. 
  5. Press the SEND button  or press the “#” key. 


  1. Take the phone off-hook.
  2. Press the SEND button  or press the “REDIAL” soft key.  

Note: The phone will redial using the same SIP account as was used for the last call. 


Single Incoming Call: 

  1. Answer call by taking Handset/Headset off hook or pressing SPEAKER or by pressing the corresponding account LINE button. 

Multiple Incoming Calls: 

  1. When there is a call waiting, users will hear a Call Waiting tone.
  2. The next available line will flash red.
  3. Answer the incoming call by pressing its corresponding LINE button.
  4. The current call will be put on hold.
  5. Toggle between the calls using the LINE button. 


  1. End a call by pressing the “End Call” soft key or hang up the phone. 


  1. Hold: Place a call on ‘hold by pressing the hold button. 
  2. Resume: Resume call by pressing the corresponding blinking LINE. 


Assuming that you are in a call and wish to transfer the call to another party. 

Blind Transfer: 

  1. Press transfer button.     
  2. Dial the number and press the send button to complete transfer of active call. 

Attended Transfer: 

  1. Press an idle line key to make a new call and the active LINE will be placed on hold automatically. 
  2. Once the call is established, press transfer  button followed by the LINE button of the held line to transfer the call. 
  3. After the call is transferred, phone will display idle screen. 

Auto-Attended Transfer: 

  1. Set "Auto-Attended Transfer" to "Yes" on Web GUI.
  2. Establish one call first. 
  3. Press transfer key  to bring up a new line, and the first call will be placed on hold automatically.  
  4. Dial the number and press SEND button  to make a second call. 
  5. Press transfer key again to make the transfer. 


Initiate a Conference Call: 

Assuming that you are already in a conversation and wish to bring a third party together in a 3-way conference.

  1. Press conference button  to bring up conference dialing screen. 
  2. Dial the third-party number followed by SEND key. 
  3. When the call is established to the third party, press the “Conf Call” soft key to initiate 3 -way conference. 
  4. Repeat step 1-3 to add the fourth party into the conference (GXP1630 only). 

Cancel a Conference Call: 

  1. Press “Cancel” soft key in conference dialing screen to resume the two-way conversation. 

Hold The Conference:  

  1. Press hold button  to hold the conference call with all parties are on hold. 
  2. Press “ReConf” soft key to resume conference call; or select the corresponding blinking LINE to speak with an individual party.  

End The Conference:  

  1. The conference will be terminated for all three parties if the conference initiator hangs up or presses “EndCall” soft key. 


A blinking red MWI (Message Waiting Indicator) indicates a message is waiting. 

  1. Press the Message button to retrieve the message. An IVR will prompt the user through the process of message retrieval.  
  2. Press a specific LINE to retrieve messages for a specific line account. 

Note:  Each account requires a voicemail portal number to be configured in the “voicemail user id” field. 


  1. Press the MUTE button  to mute/ unmute the microphone. 
  2. The Mute icon indicates whether the microphone is muted.


  1. Use the volume button  to adjust the ring volume when the phone is idle.  
  2. Press the volume button during an active call to adjust the call volume. 

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