Supported devices
ATA Adaptors
IP Phones
Cordless IP Phones
IP Conference Phones
IP PBX Software/Hardware
Desktop Softphones
Mobile Softphones

Security considerations for Callcentric customers

3CX Version 6
3CX Version 12
3CX Version 12.5
3CX Version 15
3CX Version 16
3CXPhone (for Windows)
3CXPhone (Mobile)
Aastra 6753i
Acrobits/Groundwire for iPhone
Android SIP Client
Apivio MWP1100
Asterisk 1.4 and 1.2
Asterisk 1.6
Asterisk 1.6.2, 1.8, and 10
Asterisk 14
Asterisk 17 CHAN_SIP (Vanilla)
Asterisk 17 PJSIP (Vanilla)
Asterisk Admin GUI v2.11
Asterisk Admin GUI v12
Asterisk Admin GUI v13
Asterisk Admin GUI v15
Bria Solo
Bria Desktop
Bria Mobile
Cisco ATA 186/188
Cisco SPA112/SPA122
CloudTC Glass 1000
D-Link DVG-1402S
Gigaset A510 IP
Gigaset C610A IP
Gigaset DX800A
Grandstream DP715/710
Grandstream DP750/720
Grandstream DP752/730/722
Grandstream GAC2500
Grandstream GRP2612
Grandstream GRP2613
Grandstream GRP2614
Grandstream GRP2615
Grandstream GXP1450
Grandstream GXP1620
Grandstream GXP1625
Grandstream GXP1630
Grandstream GXP1760
Grandstream GXP1782
Grandstream GXP2110
Grandstream GXP2130
Grandstream GXP2140
Grandstream GXP2160
Grandstream GXP2170
Grandstream GXP2200
Grandstream GXV3140
Grandstream GXV3240
Grandstream GXV3275
Grandstream GXV3370
Grandstream GXV3380
Grandstream HandyTone 286
Grandstream HandyTone 486
Grandstream HandyTone 702
Grandstream HandyTone HT802
Grandstream HandyTone HT814
Grandstream HandyTone HT818
Grandstream UCM6102
Grandstream UCM6204
Grandstream Wave Lite
Grandstream WP820
Htek UC803
Htek UC860
Htek UC924
Htek UC926
Innomedia SIP MTA-6328
Innomedia BuddyTalk 110
Linksys PAP2
Linksys SPA3102
Linphone Desktop (v4.1.1)
Linphone Desktop (v3.4.3)
Linphone Mobile
Linphone Mobile (v.3.2.3)
NCH Express Talk
Nokia E90
pbxnsip Version 3
Polycom SoundPoint IP 601
Polycom SoundStation IP 5000
snom 1xx/2xx/3xx
snom 820
snom D717
snom D735
snom D785
snom M9
snom ONE
Telco AC-211
trixbox / Elastix / pbx-in-a-flash
Windows Messenger
Unidata ICW1000G
Uniden EXP1240
UTStarcom F3000
Vodia PBX (v5)
Vodia PBX (v64.0)
VTech VCS754
VTech VDP650
VTech VSP600
VTech VSP725
VTech VSP726
VTech VSP735
VTech VSP736
X-Lite / X-Pro / eyeBeam
Yealink T32G
Yealink T41S
Yealink T42G
Yealink T42S
Yealink T46G
Yealink T46S
Yealink T48S
Yealink W52P
Yeastar MyPBX U100
ZoIPer 3.2
ZoIPer 5
ZoIPer Mobile
Zoom 5801
Zycoo CooVox U20
Other Linksys/Sipura products
Generic / Other Device

DID-Based Routing with Asterisk
3CX Version 12.5
For 3CX version 16 setup information please click here
For 3CX version 15 setup information please click here
For 3CX version 12 setup information please click here
For 3CX version 6 setup information please click here
For the older version please click here

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 version 12.5. For more advanced configurations and features you can combine the basics detailed 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.

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/from Callcentric. The information presented in this guide is based on Version 12.5.39117.982 (FREE Edition) of the 3CX software running on a Windows Server 2008 R2 x64 installation. Please note, if you are running a different software version (or a different software edition), some of the menu options and settings may be different. This guide assumes that you have installed the 3CX IP PBX and also that you have administrative access to the 3CX administration web interface.

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 Extensions, from the left side of the page.

Click the Add Extension link that is located at the top of the loaded page. From the Add Extensions page, enter your Extension Number, Name, and a Password. Once you have entered your credentials for this extension, please click on the OK button to continue.

STEP 2 Adding a VoIP Provider using the Callcentric template
Next click on VOIP Providers from the left side of the page. Click the Add Provider link that is located on the top of the loaded page.

Once the Add VOIP Provider Wizard page loads enter "callcentric" in the Name Of Provider field, select US as the Country and then select Callcentric as the Provider. Once completed, please click the Next button to continue.

You will now be provided with the option to configure the servers that you will connect your system to. Please click Next as these settings have already been filled in as shown below.

STEP 3 Configuring account details
Next we will configure your PBX to use your Callcentric account credentials. As detailed in the picture below, please enter 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.
3 Way Authentication ID:unchecked/ disabled

You may then set the Maximum simultaneous calls value to 3. Only users who are sure of what they are doing should change this value. After you have completed this step, please click Next.

STEP 4 Adding an inbound rule
You will now be prompted to configure the inbound routing for your incoming calls. You may send incoming calls to any pre-configured location such an extension, IVR, etc... In this example, we will select the extension that you created in the earlier steps.

Once completed, please click Next to continue configuring your 3CX system.

STEP 5 Adding an Outbound Rule
Next, you will be prompted to configure an Outbound Rule for the VoIP provider.

By default, the name of the rule should be set to Rule for callcentric. In our example, we are using 9 as a qualifier. By configuring 9 as the qualifier, you will need to dial 9 prior to every number dialed in order to send calls via Callcentric. To configure your PBX in this manner, please use the following settings:

Calls to numbers starting with prefix9
Calls from extension(s)
Calls to Numbers with a length of

On the Make outbound calls section of the outbound routes page, please specify the following for Route 1:

Route 1callcentric
Strip Digits1

To save your Outbound Rule and complete the basic setup of your system, please click the Finish button.

STEP 6 Line Status
Once you have successfully configured your 3CX phone system, you can click on the Port/Trunk Status link located on the left side of the page to see if your PBX is properly registered. If there are problems with the Registration of your system, please review the logs to see the exact reason why your 3CX System is not registering properly to the Callcentric servers.

STEP 7 Configuring advanced settings
Now that you are finished with the basic settings for your Callcentric Trunk, you can move on to configuring the advanced settings.

To configure the registration and codec settings on your Callcentric Trunk, please click on the VoIP Providers link that is located on the left side of the page and then select the Callcentric configuration. Next choose the Edit Provider option and then click the Advanced tab.

Please make sure the following is set:

Supports Re-Inviteunchecked / disabled
Supports 'Replace'unchecked / disabled
PBX Delivers Audiochecked / enabled
Disable Videochecked / enabled
Time between registration attempts (in seconds)600
Require registration forIn and Outbound Calls
Which IP to use in 'Contact' field for registration

Select Local IP Address (Windows Default Route) if your server only has a single network interface

Select Specified IP if your server has multiple network interfaces, and specify the internal IP address of your server on the given field

Now, we will configure the assigned codecs. Under the Codec Priorities section please make sure that only the following codecs are active:


Once completed, please click OK to save/apply your changes.

After doing so, we would recommend that you double check the Port/Trunk Status to make sure that your registration continues to operate normally.

That's it! Your 3CX (version 12.5) system should now be properly configured to work with the Callcentric services.

STEP 8 Configure and test UA (User Agent)
  • Choose your desired UA
  • 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
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.