User's Manual
GXP1610/GXP1620/GXP1625/GXP1628/GXP1630 User Guide Page 30 of 42 
When Do Not Disturb feature is turned on, the DND icon will appear on the right side of the LCD. The 
incoming call will not be accepted or the call will directly go into voicemail. 
DURING A PHONE CALL 
CALL RECORDING 
During an active call, users could record the conversation to the UCM61xx Series server and download the 
record to PC and listen to it with the help of the server administrator. Please contact server administrator to 
ensure the PBX feature codes for Audio Mix Record is enabled on UCM before using call recording feature. 
In the process of establishing the call, when get through, press the RECORD key   to start recording. 
Press   one more time to stop recording. 
Note:  
Recording feature is available when using the Grandstream UCM series IP PBX appliance, or the PBX 
which supports this  feature. The record file will be saved  automatically to UCM  or the supported PBX. 
Please contact the UCM server administrator, or the supported PBX administrator to download the file from 
the server. 
CALL WAITING/CALL HOLD 
  Hold. Place a call on hold by pressing the HOLD button. The active LINE key will blink in green; 
  Resume. Resume call by pressing the blinking LINE key; 
  Multiple calls. Automatically place active call on hold or switch between calls by pressing the LINE key. 
Call waiting tone (stutter tone) will be audible on new incoming call during the active call. 
MUTE 
During an active call, press the MUTE button to mute/unmute the microphone. The LCD will show the Mute 
icon on the top of screen, when the call is muted. 
CALL TRANSFER 
GXP1610/GXP1620/GXP1625/GXP1628/GXP1630 supports Blind Transfer, Attended Transfer and Auto-










