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Security considerations for Callcentric customers

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Grandstream GXP2140

GENERAL INFORMATION
The Grandstream GXP2140 is a full-featured IP phone designed for Enterprise and SMB Users. This IP Phone features a large LCD Display, support for up to 6 SIP accounts, PoE (Power Over Ethernet), and HD Audio.


RESOURCES
Websites
Grandstream Homepage
Grandstream GXP2140 Product Page

Help/Support
GXP2140 Product Manual


Configuring the GXP2140
This setup guide is for the Grandstream GXP2140 and is based on firmware revision 1.0.7.99. If you are running a different firmware version some of the menus/settings may be different. These instructions are also based on using the GXP2140 in its factory default configuration, which obtains a dynamic IP address automatically from your router using DHCP. For information on configuring your GXP2140 with a Static IP Address, please refer to the GXP2140 user manual.

In this guide we will go through configuring the GXP2140 in order to register to the Callcentric servers so that you will be able to place and receive calls using your Callcentric account. Before moving forward please ensure that you have properly added the device to your network by connecting it to your router or gateway.

We recommend that you read each step through in its entirety before performing the action(s) indicated within the step.

Note: Although this device supports many advanced features/options; this guide will only detail the specific settings which are required to establish basic connectivity between your GXP2140 and our service. If you need additional assistance with any specific issue please let us know.
Step 1 Logging into your device
Login to the GXP2140's administrative interface by using the default username (admin) and default password (admin).



Step 2 Configuring your Callcentric account
Click on the Account option located on the top menu bar and then select Account 1 from the sub-menu.



You should now be in the General Settings configuration page of your IP phone. Please use the settings detailed in the screen captures below. After you have finished entering these settings, click on the Save and Apply button to apply/save your settings:



SettingValue
Account ActiveYes
Account Namecallcentric
SIP Servercallcentric.com
Outbound Proxycallcentric.com
SIP User IDThis is either the default extension 1777MYCCID OR 1777MYCCIDEXT, where 1777MYCCID is the 1777 number assigned to you by Callcentric and EXT is the three digit extension you are trying to register this UA to.

For example: 17770001234101 would register to extension 101 on account 17770001234.

You cannot register to your account using only the extension number.
Authenticate IDThis is either the default extension 1777MYCCID OR 1777MYCCIDEXT, where 1777MYCCID is the 1777 number assigned to you by Callcentric and EXT is the three digit extension you are trying to register this UA to.

For example: 17770001234101 would register to extension 101 on account 17770001234.

You cannot register to your account using only the extension number.
Authenticate PasswordEnter your extension SIP Password here. Your extension SIP password is the password you created for the extension you are trying to use. You may edit the SIP password you wish to use in by logging into your My Callcentric account and clicking on the Extension menu link and then modifying the appropriate extension.
NameYou may specify any name on this field
Voice Mail Access Number*123


Next, click on Network Settings which is located on the side menu bar. On this page, please use the settings detailed in the screen captures below. After you have finished entering these settings, click on the Save and Apply button to apply/save your settings:



SettingValue
DNS ModeSRV
NAT Traversalkeep-alive


Next, from the side menu bar, navigate to the SIP Settings >> Basic Settings. On this page, locate the option Remove OBP from Route and set it to Yes. After you have finished entering this setting, click on the Save and Apply button to apply/save your settings



Next, click on Audio Settings which is located on the side menu bar. On this page, please use the settings detailed in the screen captures below. After you have finished entering these settings, click on the Save and Apply button to apply/save your settings:



SettingValue
Preferred VocoderChoice 1 - PCMU
Choice 2 - G729
Choice 3-8 - PCMU
Send DTMFcheck/enable both in-audio and via RTP (RFC2833)


Next, click on Call Settings which is located on the side menu bar. On this page, please use the settings detailed in the screen captures below. After you have finished entering these settings, click on the Save and Apply button to apply/save your settings:



SettingValue
Dialplan{[x*]+}


Finally from the side menu bar, locate the Feature Codes configuration page. On this page, locate the Enable Local Call Features option and set this to No. After you have finished updating this setting, click on the Save and Apply button to apply/save your settings:



Step 3 Checking Registration Status
To ensure that your GXP2140 has successfully registered to our service click on the Status option on the top menu bar and locate the Account Status section. You should see that the account you just configured is now Registered.



Step 4 That's it! You can now make a phone call.
You can make a test call to 17771234567, or if you are signed up for one of Callcentric's rate plans you can place a call to a traditional landline or mobile phone by dialing either:
1 + the area code and number for calls to the US
Or
011 + the country code, area code, and number for calls worldwide (you may also use 00 instead of 011).

To test inbound calls from Callcentric to your GXP2140 installation, follow the directions listed in this FAQ.