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VoIP phone systems for the digital age

VoIP is putting small business communication on the enterprise level with reliable connectivity and low monthly costs.

Frequently asked questions


Open the Communicator EMEA application.
You will be prompted to input your username and password.
Before selecting the Sign In button, please select the Settings Icon (cogwheel)  in the bottom right of the screen

If you have selected “Offline” status, you are shown as offline to others. Another possibility is that you may have lost your Internet connection. In this case, the client does not log out, but rather enters an offline mode where a contact list is available but communication is not possible.

Why can’t I change my username and password?

Username and password editing is not supported in the client. To edit your user name or password, contact your service provider. The exception is login password expiry. When it expires, you can change the password in a separate dialog window.

In the preferences, the client only supports changing LDAP credentials. Desktop sharing credentials may also be changed, depending on your service provider settings.

I have a USB headset and the call control features are not working. Is there anything special I need to do to enable call control support?

In order to use headsets on Windows (not supported on OS X), several steps are needed:

1) When the client is started, you must accept the API connection request from the connector/add-in device.

2) Additionally, your client must have the feature enabled by your service provider.

System requirements are as follows on native desktop:

  • Operating system: Mac OS 10.9 Mavericks, Mac OS 10.10 Yosemite, Mac OS 10.11 El Capitan, Windows 7, Windows 8/8.1, or Windows 10 (Classical view only).
  • The installation footprint is approximately 125 megabytes (MB) on OS X and 215 MB on Windows.
  • For voice calls, a sound card, speakers, and a microphone or a headset are required.

Minimum system requirements for respective operating systems need to be fulfilled, with the following additions:

  • A minimum of 2 GB random access memory (RAM) is required.
  • A minimum 1.5 GHz CPU is recommended.
  • Open Graphics Library (OpenGL) 1.5 or higher is recommended.

The following are additional requirements for the UC-One Add-in for S4B.

  • Windows
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows 10
  • Lync/S4B
  • Lync 2010 32-bit
  • Lync 2013 Basic 32 and 64-bit
  • Lync 2013 Standard 32 and 64-bit
  • S4B 2015 32 and 64-bit
  • S4B 2016 32 and 64-bit
  • Communicator 21.2.0 or later (21.4.0 is recommended)
  • Windows administration rights (due to required registry entry)

Installer supports a number of options on Windows (native desktop only):

  • Agree to the license agreement.
  • Run when system starts (can be changed later in Preferences window).
  • Create a desktop icon.
  • Select destination folder for installation.
  • Select name of the software in Program menu.
  • Launch client after installation.

When installer has been run on an end user’s behalf by an administrator, the “Run program when system starts” option cannot be changed that end user.

If you disable startup, for example, in the Task Manager’s Startup list (on Windows 8 and 10) or from msconfig.exe on Windows 7, the change is not reflected in Preferences. The checkbox remains checked and grey even though the client is not actually started automatically when the system starts.

When Communicator is installed for the first time, you can choose the language if many languages are supported in the installer. The default language is the language of the operating system; if that cannot be found, English is used as the fallback.

To exit the application completely, follow these steps.

Windows and OS X

Close the Sign In window.


  1. Select the Communicator logo in the Main window title bar.
  2. Click Exit (a keyboard shortcut can also be used).


  1. Select Communicator from the main menu.
  2. Select Quit Communicator (a keyboard shortcut can also be used).

NOTE: Closing the Main window (not the Sign In window) does not exit the application but rather minimises the application to the system tray (Dock). This allows you to continue to receive calls and messages without having the Contact List window appearing on the desktop.

The Anonymous Call Rejection service allows you to reject calls from parties who have explicitly restricted their identities.

You can enable or disable anonymous call rejection in the Preferences and Incoming Calls tab.