Grandstream GXP2120 IP Phone - Wiki

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Grandstream GXP2120 IP Phone

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Grandstream GXP2120 IP Phone

Configuration Detail

Step 1:

You must first determine what IP address the IP Phone was assigned. To do this, press the round menu button, then the down arrow next to it until the display shows:

[2] IP Addr

Now, press the round menu button again and you will be shown the IP address of your device (e.g.

Step 2:

Open your web browser and go to the IP you just found: https://[DeviceIP]

Step 3:

You will be prompted to enter a password, the default is "admin", then click the "Login" button.

Step 4:

Click on ACCOUNT, followed by the ACCOUNT 1 (to configure your line 1). You need to modify only a few settings from the factory default.

Fill in the followings fields.

  • SIP Server: (You can enter the address of any of our multiple servers, this is just an sample with Atlanta server)
  • SIP User ID: 100000 (Replace with your username, it is a six digit number)
  • Authenticate Password: ********* (Type your account Password)
  • SIP Registration: Yes
  • Register Expiration: 5
  • Name: Your Outbound CallerID Name (See the requirements below).
  - We suggest entering your outbound Caller ID Name must be in capital letters. This will appears more clearly/visible on some devices.
  - You must NOT use any special characters, they will not be displayed. 
  - Enter a max of 15 characters. Some of regular Canadian providers will not show more than 15 characters max. We suggest shrinking or adapt your caller ID. 
  - Spaces are allowed in a caller id name.

Step 5:

Finally, please click the Update button and then Reboot at the bottom of the configuration screen.


Ghost Calls

If you receive Weird Calls such as from CallerID 100 or in the middle of the Night not showing in your CDR, please note that these calls are not going through our Network but rather through the internet directly to your IP Phone without authentication.

Users have the ability to deny calls that are not authenticated. You can find the option by navigating the phone web interface, clicking on Account X-->SIP Settings-->Security Settings and enabling "Authenticate Incoming invite" You can also go to Account X -> SIP Settings -> Security Settings -> and enable "Accept Incoming SIP from Proxy Only"

Guide Links

In the event where you need the guide directly from Grandstream, you may find the user manual guide below:

User Manual : Download PDF

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