Link a Door Phone to 3CX Phone System

3CX, the maker of the 3CX phone system for Windows, has just released a handy guide to linking a Door phone to your telephone system.

Firstly you should disable outbound calls for security purposes. Then create an extension in the 3CX Management Console for the door phone. The image below shows what the back of the phone should look like when you take the case off.

Then you connect the Network UTP cable to the Ethernet connection (Number 13 on the image above). Ideally you should connect it to a POE Network Switch. Alternatively, you would need to also connect a 12v power supply to the power block (Number 22). For more details on how to connect this and the specifications for the power supply please refer to the 3CX user manual or contact AlphaTech support.

Look for the DIP switch which is located in the middle of the circuit board (Number 14). The switch settings are as shown below:

•On the DIP switch, set all switches to ON except switch number 2, which must be set to OFF.
•Close the box and switch on the device.
•The Default IP address of the door phone as set by the manufacturer is If you are installing with your PC in a different subnet, it will be necessary to set up a network card with an IP address in the same subnet range so you can connect to the device and make the necessary changes.
•Launch your web browser enter the IP address of the Door Phone (
•In the page that loads up, click on the link ‘Setup’
•Enter user name and password (by default the name is ‘admin’ and the password is ’1234′)
•The Device config page will now load up.

•Click on “Network Settings” and set up the settings as required for your Network . When done click on ‘Save and restart’ and then connect using the new IP address.

•Click on “SIP parameters” and configure the settings as follows:
SIP proxy server
1.Address: IP of 3CX server
2.Port: the 3CX sip port (default 5060)
SIP registrar server
1.Address: IP of 3CX server
2.Port: the 3CX sip port (default 5060)
Account module
1.Name: Extension Number configured in 3CX Phone System to be used for the door phone
2.Password: Authentication Password of the Door Phone Extension Number
3.Auth. Id: Authentication ID of the Door Phone Extension Number
4.Expiration [sec]: 600
•Click on ‘Save changes’

•Click on sip ‘Setting Audio’ and set priority 1 to G711u, priority 1 to G711a and priority 3 to G729. Click on ‘Save changes’.

•Click on Memory numbers and in Button 1 and Button 2 put in the numbers of the extensions you want to ring when the door bell is pressed. For multiple extensions to ring, set up a Ring All ring group and insert the Ring Group number instead of an Extension Number. Click on ‘Save changes’.

•The doorbell can now be used with 3CX. When the doorbell is pressed, the configured extension (or ring group) will ring and can be answered by answering the phone of the ringing extension.

•To open the door set up the door lock with the relay as specified in the manual and also set up the correct opening codes in Fermax config Relays section.

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