How to Configure Your Grandstream Phone (GPX21(20,30,40)
How to Configure Your Grandstream Phone (GPX21(20,30,40)
Configure Grandstream General settings
Configure Grandstream General settings
Set BLF and speed dial Grandstream
Set BLF and speed dial Grandstream
Set internal ringtone Grandstream
Set internal ringtone Grandstream
Adjust the internal number on a Grandstream
Adjust the internal number on a Grandstream
Wrong phone number is visible after transferring
Wrong phone number is visible after transferring
Set up encrypted calling
Set up encrypted calling
Restore Factory Default Setting
Restore Factory Default Setting
How can I turn on/off DND(Do Not Disturb)?
How can I turn on/off DND(Do Not Disturb)?