User Guide
Grandstream Networks, Inc.  GXP User Manual  Page 22 of 44 
       Firmware 1.2.5.3     Last Updated: 03/2011 
NOTE: The party that starts the conference call has to remain in the conference for its entire duration, you 
can put the party on mute but it must remain in the conversation. 
Voice Messages (Message Waiting Indicator) 
A blinking red MWI (Message Waiting Indicator) indicates a message is waiting. Press the MSG button to 
retrieve the message. An IVR will prompt the user through the process of message retrieval. Press a 
specific LINE to retrieve messages for a specific line account. 
NOTE: 
•  Each line has a separate voicemail account. Each account requires a voicemail portal number to be 
configured in the “voicemail user id” field. 
•  To check which line account has a message 1) press the message button (this always checks the 
primary account), 2) check each line for stutter tone or 3) check missed calls using the menu. 
Busy Lamp Field 
The Multi Purpose Key buttons can be configured for Busy Lamp Field function with a specified account. 
When BLF is configured on one of the multi-functional buttons, the Speed Dial function will work when that 
line is not in use. Call Pick Up is supported when user presses a flashing BLF key. 










