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Once the position of the base stations is determined, can proceed installing the multi cell system.

In contrast to desktop telephones, the DECT configuration is split for ease of understanding.

The multicell is filled with network- and DECT specific information. The handsets themselves are filled with the SIP identities.

How to set up a DECT Multicell with Snom M700/M900 devices

Find an Example configuration for a multicell on a 3CX PBX here: Setting up a M700,M900 Multicell with 3CX


  1. Start with the first base:

    ATTENTION:  Before you set up another base, the first, primary base must be completely set up. This will then show "Allowed to Join as Primary" at the end.

    • To access the base, enter the IP address of the base into a web browser, and

      use the default credentials for "username" and "password": admin

      How to find the IP address of your base is described in the following article: How to enter M300, M700, M900 - Web Interface

    • Updating the firmware to the latest version

      Please check in advance whether the latest stable Firmware version is installed on your DECT base station (M700/M900) and your DECT handsets (M25/M65/M70/M80/M85/M90).

    • Configure the NTP server and the proper Country / time-zone
      WUI → "Country"

    • Configure the SIP server
      WUI → "Servers"

    • Configure at least one SIP account
      WUI → "Extensions"

    • Enable "multi cell mode"
      WUI → "Multicell"

      Check the "System Chain ID" (value 512 is default, can be changed to realize special scenarios.)


    • Configuration of data synchronization = Multicast (you can also choose Peer-to-Peer, but this should only be used temporarily)
      Better always use "multicast"!
      WUI → "Multicell"

      In the Multicell, all changes will be propagated automatically over all the bases.


      Peer-to-peer: in case the system is set using peer-to-peer you must change the settings on the Primary data sync DECT base. Changing a setting on another base will not trigger a setting synchronization.
      "Multi primary" should be avoided except for some very specific situation
      In production the DECT tree should be calculated automatically by the system in order to offer the best coverage and redundancy
      → Multi Cell


    • Reboot the base

  2. Once the base is rebooted, you should see the status "Ready to join as Primary" in the device home page


  1. Set up the second base (and each subsequent base in the same way)

    Caution: Do not start setting up the second or additional bases until the first, Primary Base is fully configured. Please note that the configuration of a primary base is different from the configuration of all other bases. Therefore, only perform the steps listed here.

    • Make sure that the base is set to the factory default values, reset them if in doubt:  How to factory reset the M300,M700,M900

    • Update the firmware to the  same version as the primary Base

      Attention: All bases of a multi-cell must use the same firmware.

      Tip: If admin/admin doesn't work the first time you press it, just send it a second time. This is intended as a security feature to remind you to change the default credentials.
    • Configure the NTP server and the proper Country / time-zone
      WUI → "Country"

    • Enable "multi cell mode"
      WUI → "Multicell"

      Be sure to set "System Chain ID" to the same value as the first, primary base (default is 512).

    • Reboot the base

  2. After restarting the base stations the base should connect to the system, this can take up to 15-20 minutes.

  3. Install all base stations in the same way as the second one.

  4. Register the handsets with the system.
    DECT - 3.1 Add Extensions

Step by step Guide:


  1. First we have to configure the so called Data Primary.

    • Go to the web interface of your M700/M900 and go to the section "Servers".

    • Standard username and password are admin/admin.

      Tip: If admin/admin doesn't work the first time you press it, just send it a second time. This is intended as a security feature to remind you to change the default credentials.




    • Click on the item "Add Server".


    • Here you have to enter the registrar and make further settings if necessary.

  2. Add Extensions



If a base station doesn't join the system, please look at the following articles:


Here you find a nice Video how to deploy a dect multicell Solution with a 3CX.


Further Information


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