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Grandstream GXP2135

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Grandstream GXP2135

A high-profile desktop phone built for the busy user. The GXP2135 is a sleek High-End IP phone that will bring higher levels of communication productivity to a network. Its modern design, high call capacity, and rich functionality make it the ideal choice for the call-intensive worker.



Once you have connected your device to your local connection, it will be necessary to obtain the local IP address that was designated for it.

-From your IP phone navigate through the menus to obtain its IP address:

Menu >> Status >­> Network Status >> IPv4 Address

-Now that you have the Local IP address, open it in your web browser of preference.


-Once you have opened the login page, use the following credentials to access to the configuration:

Username: admin

Password: admin


General Settings

-Once you see the settings page, go to the following:

Account >> Account # >> General Settings

  • Accountsgxp2135.PNG
  • Account1gxp2135.PNG
  • Generalgxp2135.PNG

-Change the following settings according to the information of your account:

A. Account Name: The name for this account that will be displayed on the LCD screen of your phone.

B. SIP Server: The server that you will use for the registration of this device. (one of multiple servers, you can choose the one closest to your location.)

Notice that it is necessary to use the same server for both the device and the DID number in order to get incoming calls correctly

C. SIP User ID: The account or sub-account number that you will be using for this line.

D. Authenticate Password: The password for the account or sub-account you will be using for this line.

E. Name: The name that will be used as Caller-ID Name. (Notice that this only applies for Canada)

F. Save and Apply


Basic SIP settings

Once this is done, we will need to set the time that the device will send the information for its registration status.

-Please go to the following:

Account # >> SIP Settings >> Basic Settings

  • Account1gxp2135.PNG
  • Sipsettingsgxp1.PNG
  • Basicsettingsgxp01.PNG

- Change the following:

SIP Registration: Yes

Register Expiration: 5 (this is in minutes)

Enable OPTIONS Keep Alive: Yes

Finally, click Save and Apply

Common errors

Outgoing calls issue

If you are able to receive incoming calls but outgoing calls are failing with error "No response", make the following changes to fix it:

1. Login into your device's settings and head to Accounts > Account X > SIP > Custom SIP Header and disable:

SIP Headers GXP.png

2. Go to Accounts > Account X > SIP > Audio Settings, and choose codec G729A/B as preferred Vocoder and the rest with PCMU.

Audio codecs GXP.png

Guide Links

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

User Manual : Download PDF

Admin Manual : Download PDF

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