Grandstream GXP21xx Setup Guide

The Grandstream GXP21xx is a series of business IP phones that you can use with your Telzio phone system. There are 5 different models in the GXP21xx series, offering up to 8 lines, 48 busy lamp field keys, and simple web configuration.

In this article, you’ll learn how to configure phones in the Grandstream GXP21xx series to use with Telzio.

Important Notes

  • You must have a user before you can configure your phone.
    Learn more about Getting Started with Users.
  • If you’re using an IP phone that was used with another provider, do a factory reset on the phone before you get started.
  • This guide pertains to all phones in the Grandstream GXP21xx series, including the GXP2130, GXP2135, GXP2140, GXP2160, and GXP2170.
  • We recommend you to upgrade the firmware to make sure you have all the latest features. Upgrading the firmware is not required to configure your phone.

How to Set Up a Grandstream GXP21xx

This section will walk you through the setup instructions for the Grandstream GXP21xx series. Follow these steps to configure your phone:

Log into the phone’s web interface.

  1. Press the up arrow on the phone to display its IP address. If you don’t see an IP address, this likely means the phone does not have internet connectivity. Make sure the ethernet cable is connected to your router and the LAN port in the back of the phone. 
  2. Type the IP address that you see on the phone into your web browser to find its interface.

  3. Type in the following Username and Password, and click Login.
    Username admin
    Password admin

    It’s important to make sure there are no spaces before or after ‘admin’ in order for the username and password to be valid. You’ll be prompted to change the password when you first log in.

Configure the phone with the User.

The Grandstream GXP2135, for example, supports up to 4 user accounts, which means you can configure up to 4 different users on your phone.

When you first log in, you’ll notice there are 4 accounts available for configuration. We’ll start with configuring one user for Account 1, and you can configure additional users on the phone by repeating the steps for Accounts 2 through 4.
List of active accounts

  1. Navigate to: 

    Enter user credentials

  2. Enter the following information in the fields provided.

    Account Active Yes
    Account Name Enter the name as you want it displayed on the phone.
    SIP Server sip.telzio.com
    SIP User ID Enter the Username
    Authenticate ID Repeat the Username
    Authenticate Password Enter the Password
    Passwords are case sensitive.
    Name Enter the name as you want it displayed for caller ID. 
    Voice Mail UserID *98
    This enables you to press the voicemail icon on the phone to access voicemail.
  3. When you’re finished entering the information, click on Save and Apply

Setup Dialplan

  1. On the phone’s web interface, navigate to: 
  2. Replace the content in the Dial Plan field with:
    { X+ | x+ | \+x+ | *x+ | *xx*x+ }‚Äč
  3. Click Save and Apply

Enter the Network Settings.

  1. On the phone’s web interface, navigate to: 
  2. Change the setting for NAT Traversal to Auto
  3. Click Save and Apply

Enable Voicemail Notifications

To visually see when you receive a new voicemail message, you must enabled Voicemail Notifications on the phone. The phone will then start blinking a red light when you have unlistened messages.

  1. On the phone’s web interface, navigate to: 
  2. Set SUBSCRIBE for MWI to Yes
  3. Click Save

Enable Intercom and Paging

Enabling Intercom and Paging will allow the phone to automatically answer a call and put it on speaker, when someone either pages or starts an intercom call with your extension.

  1. On the phone’s web interface, navigate to: 
  2. Set Allow Auto Answer by Call-Info to Yes
  3. Click on Save and Apply

Configure Busy Lamp Field (BLF) keys.

BLF keys enable you to see when other users in your organization are currently on a call. For example, you can set up to 32 BLF keys on the Grandstream GXP2135, which means you can view presence for up to 32 other users in your organization.

  1. On the phone’s web interface, navigate to: 

    You’ll notice rows 1 through 4 have Mode  set to LINE  by default because the GXP2135 model supports up to 4 user accounts. If you have 4 different users configured on your phone, you can switch between user lines by hitting the 4 keys along the left side of the display. If you have one user configured on the phone, you can set each of the 4 keys to the one user, or set them as BLF keys.Set up multi-purpose-keysWe’ll start by configuring the fifth key as BLF, and you can repeat the steps to configure additional keys. If you configure more than 8 keys, additional pages will be created on the phone’s LCD and you’ll see a Next button enabling you to scroll through the pages.
  2. Click on Edit VPK
  3. Set the Mode to Busy Lamp Field (BLF)
  4. Next to Description enter the name of the user as you want it displayed on the phone.
  5. Next to Value enter the Username of the person or phone.
    Setup BLF settings
  6. Click Save
    Overview of multi-purpose-keys
  7. When you’re done configuring the keys, click Save VPK