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3CX is a Windows based software PBX that offers a vast assortment of customizable options and settings. This setup guide is intended to show the most basic configuration of the 3CX Phone System. For more advanced configurations and features you can combine the basics included in this guide along with the 3CX documentation.

Please note, Callcentric is not responsible for preventing unwanted physical or remote access to your IP PBX. If your IP PBX is compromised, you will be responsible for all associated damages.

Please be sure to read this guide regarding securing your IP PBX solution.

RESOURCES

Website:
3CX Homepage

Help / Support
3CX Forums
3CX Support Page

Configuring 3CX

Here we will configure the 3CX IP PBX through the web interface to properly route both incoming and outgoing calls to and from Callcentric. The information presented in this guide is based on Version 3.1.2434.0 (FREE Edition) of the 3CX software. If you are running a different software version (or a different software edition), some of menu options and settings may be different. This guide assumes that you have installed the 3CX IP PBX and that you have administrative access to the 3CX administration web interface.

NOTE: We have tested out the 3CX software and found that the method it uses for call transfer is not supported by Callcentric. You can however use call holding properly with our servers.

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

STEP 1

Adding an extension

Log into the 3CX administrative interface and click on the Add link under the Extensions header, from the left side of the page. From the Add Extensions page, enter in your Extension Number, your name, and a password. Once you have entered in your credentials for this extension, please click on the Next button to continue.

STEP 2

Adding a VoIP Provider

Next click on the Add VOIP link under the Lines header. Once the page has loaded enter callcentric in the Name Of Provider field. Once you have entered the above, please click on the Next button to continue.

On the next page, please enter the following as indicated on the images below:

VoIP Provider = callcentric
Registrar/Proxy Hostname or IP:	sip.callcentric.net
Outbound Proxy Hostname or IP:	sip.callcentric.net
Registrar/Proxy Port:	5060
Outbound Proxy Port (default is 5060):	5060

Registration settings
Time between registration attempts (in seconds):	3600
Require (optionally: authorized) registration for:	Both in-out calls
Which IP to use in 'Contact' field for registration:	Internal

Codec Priorities
Assigned codecs:	G.711U-law G.711A-law GSM-FR

Click on the Next button at the bottom of the page to proceed.

STEP 3

Account Details

Once you have added the VoIP Provider, you should be prompted to enter in your user credentials. As indicated on the picture below, please enter in the following:

External Number:	This 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.
Authentication ID:	This 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.
Authentication Password:	Enter 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.

STEP 4

Adding an Outbound Rule

Next, you should be prompted to enter an Outbound Rule for the VoIP provider. By default, the name of the rule should be set to Rule for "callcentric". Please ensure that the Calls to Numbers starting with field is blank. You may of course change this later to any number you wish. By doing so an extension would need to dial the set number on an outbound call, for example a popular qualifier is often the number 9. To save your Outbound Rule, please click on the Finish button.

Rule Name:	Rule for "callcentric"
Calls to Numbers starting with:

STEP 5

Line Status

Once you have successfully configured your 3CX phone system, you can click on the Line Status link on the left side of the page to see if the PBX is registered.

STEP 6

Configure and test UA

Choose your desired UA (phone)
Use the IP address or hostname for your 3CX phone system along with "100" (the extension created earlier which is the username) and the password for the 100 extension to connect to your 3CX phone system.

Next you will want to try placing test calls to and from your 3CX phone system using the UA currently connected to your newly created extension (100).

Once you have associated your UA to your 3CX phone system, 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 3CX installation, follow the directions listed in this FAQ.