Configuring Linksys SPA-901 for 3CX Phone System

IMPORTANT This guide has been tested with firmware version 5.2.5(a). Be aware that different firmware revisions may have different web interface formats and functionality. See compatibility list for latest phone firmware revisions that we have tested with 3CX Phone System.

  1. Ensure that you have created the extension that you wish to use with the phone in 3CX Phone System first. Take note of the ID field and the password that you have entered for the extension.
  2. Connect the LINKSYS SPA-901 phone to the network and mains power supply. The phone will boot up, and providing you have DHCP installed on your network, will obtain an IP address. You can configure this manually from the phone by accessing the phone menu using ‘****’.
  3. Now point your browser to the web interface of the phone: ‘http://<phone-ip-address>’ where <phone-ip-address> is the IP address shown on the phone. (Refer to figure 1)
  4. By default the phone has no password set so you will be presented with the interface
  5. Click on ‘Admin Login’ option at the top right hand corner.


    Figure 1
  6. Now click on the “ext1” tab to configure the extension. Now configure the account for the phone. First of all make sure that ‘Line Enable’ under General is set to YES. (Refer to figure 2)
  7. In the Proxy and Registration category, enter the IP or FQDN of the 3CX Phone System server. If entering an FQDN, review this FAQ.
  8. In the Subscriber Information category, in the “Display Name” field enter the name you want to be displayed on the Phone display.
  9. Now proceed by entering in the “User ID” field which is the extension you want to associate with this phone.
  10. Enter a password for the user ID in the “Password” field.
  11. If you are planning to use an authentication ID, select YES in the ‘Use Auth ID’ field and enter the authentication ID in the “Auth ID” field.
    These fields must match the ID & password configured in the ‘ID’ & ‘Password’ fields in the Authentication section of the ‘Add Extension’ page in the 3CX Management Console.
  12. Now “submit all changes” which is on the bottom of your screen. Your phone will restart. After a few seconds your phone will register with the 3CX phone system. You can verify that on the Phone System\Line Status page of the 3CX management console.


    Figure 2
  13. Click on the ‘Phone’ tab to configure the Voice mail information
  14. Now proceed by entering ‘999’ in the “Voice Mail number” field.

Call Pickup

To be able to pick up a ringing extensions using the Linksys phone, input *20*xxx in the “Feature Dial Services Codes”, under the “Vertical Services Activation Codes” in the Regional Tab as per the screenshot below. The *20* is the code used in 3CX Phone System to pickup calls, therefore if this was changed, input the value you changed it to instead of the *20*. The xxx represents the number of digits each extension has, therefore if the 3CX Phone System is installed using 4 digit extensions, 4 x must be inputted.

SIP Phone Configuration Guides