How to configure Yealink T42G for use with OpenScape Cloud

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Tested model: Yealink T42G.

The phone has been tested with OpenScape Cloud with the following software and hardware versions:
  • Software version

  • Hardware version

Please note that the Yealink model T42G is End-Of-Life as described in the official web-page of Yealink. For more information about the device please refer to the EOL Products section at the official site.

The instructions provided below are likely valid for other software versions or compatible devices but Unify will not validate it.

A 3rd party device configuration should be done by your ICT service partner or company administrator. Support from Unify for 3rd party devices is restricted to provide a generic configuration of OpenScape Cloud so that a device can be connected, and to operate the Cloud solution. If you have issues when setting up a 3rd party device, including its connection to OpenScape Cloud, or with its features and functions, please contact your 3rd party device supplier.

  • A Circuit domain administrator has assigned a phone number and desk phone to the user who will be using the phone.

  • Make sure you have the following SIP information:

    • User ID: this is usually identical to the phone number assigned to the user who will be using the phone.

    • User-specific password for SIP digest authentication.

    • SIP server address and port.

  • Make sure you have the necessary certificate for establishing a secure TLS connection to OpenScape Cloud: RootCA.pem.

  • It is recommended that you perform a factory reset of your device, if the device has already been used in the past. This way, you can make sure that you have a smooth process of configuring your device without implications.

SIP information and certificate is obtained in self service from Circuit domain administrators who need to navigate to Administration > Cloud telephony and then select the user who will be using the phone.

To configure the phone for use with OpenScape Cloud, perform the following steps:

  1. Connect the phone to the network and power source.
  2. When you power on the phone, the systems boots up and starts the following process:
    1. The phone performs an automatic initialization.
    2. The phone’s screen displays the message "Initializing...please wait".
    3. The device attempts to contact a DHCP server in your network to obtain valid IPv4 network settings (e.g. IP address, subnet mask, default gateway address and DNS address) by default.
    4. Wait until the DHCP server is configured and accept a network IP address.
  3. If DHCP is not used in the network or the phone cannot discover an DCHP server in the subnet you have to configure your network settings manually. To configure the IP address via your phone’s user interface do the following:
    1. Press Menu > Settings > Advanced Settings.
    2. In the password field enter admin.
    3. From there press Network > WAN Port.
    4. Press the left arrow, right arrow or Switch key to select IPv4 or IPv4 & IPv6 from the IP Mode field (IPv6 only is not currently supported).
    5. Press Save to enable the change.

      To configure a static IPv4 adrdress via the phone’s user interface do the following according to your configuration:

    6. Follow steps a) to c).
    7. Press the down arrow key to select IPv4 and press Enter.
    8. Press the down arrow key to select Static IPv4 Client and press Enter.
    9. Enter the desired values in the IP Address, Prefix, Default Gateway, Primary DNS and Secondary DNS fields respectively.
    10. Press Save.
  4. To access the main web interface of the Yealink phone:
    1. Open a web browser on computer located in the same network as the phone.
    2. Enter the phone’s IP address in the address field of your browser: http://phone's_ip_address. The device’s web page will open.
    3. Type admin in both the Username and Password fields.
    4. Click Confirm.
  5. To reset the phone to its factory settings, reboot it or upgrade the phone’s firmware through the web interface:
    1. Navigate to Settings > Upgrade from the main interface.
    2. Press Reset to reset the phone or Reboot to reboot the device.

      You might wait a few seconds till the Reset or Reboot process is finished. Then you will be prompted again to the initial login screen. To login, type again admin to both the Username and Password fields, unless you changed the credentials manually.

    3. To upgrade the firmware select the relevant file by pressing Choose File and then press Upgrade.

      If you want to reset the phone to its factory settings through the phone’s user interface you have to navigate to Menu > Settings > Advanced Settings > Reset to Factory on your LCD screen, using the password admin and then press the Enter soft key.

  6. Navigate to the Status tab to see useful information about the phone:
  7. You will be prompted to a screen with useful information about the status of the phone. Check if all information in this page is correct and if not, modify it accordingly.
    1. Make sure the Firmware Version is the latest one, e.g: or later.
    2. Check if the Hardware Version is correct.
    3. Check the IP information like the WAN IP Address, Port Type and Gateway port number.
    4. Justify that the Link Status is Connected.
    5. At the Account Status section you can see three account fields, e.g. Account1, Account2 and Account3 as well as their status.
  8. Next, navigate to Account > Register.
    1. Choose Account1.
    2. Set Line Active to Enabled.
    3. In the Label field enter a label for the device.

      The Label is displayed on the phone like the keyset lines.

    4. In the Display Name field, enter the name you want to appear on the phone display. It is recommended that you enter the full name of the user who will be using the phone as First Name <space> Last name.
    5. In the Register field, enter the SIP server address and port you obtained from a Circuit domain administrator.
    6. In the User Name field, enter the User ID you obtained from a Circuit domain administrator.
    7. In the Password field, enter the user-specific password for SIP digest authentication you obtained from a Circuit domain administrator.
    8. In the Transport field select TLS from the drop down menu.
    9. In the SIP Server 1 section, in the Server Host field enter the server host credential and port address that you obtained from a Circuit domain administrator.

      The server host credential can also be your DNS name or IP of the OpenScape Cloud's SIP server.

    10. Click Confirm.
  9. Navigate to Account > Advanced to choose the preferred language, e.g. English.
    1. On the RTP Encryption(SRTP) field, select Force SRTP from the drop down menu.
    2. Click Confirm.
  10. Navigate to Settings > Preference to choose the preferred language, e.g. English and click Confirm.
  11. Navigate to Settings > Time & Date to add the time zone, time and date format and enter information about the Primary server and click Confirm.

    The primary server usually refers to node A of a cluster of nodes.

  12. Navigate to Security > Trusted Certificates to:
    1. Check the information about the trusted certificates as the IP number they are issued to, who issued them, and the certificates’ expiration date.
    2. It is recommended to select Enable in the Only Accept Trusted Certificates option.
    3. Disable the option Common Name Validation.
    4. Choose one of the available options, e.g. All Certificates, at the field CA Certificates
    5. Import Trusted Certificates, if needed, by clicking Choose File and opening a file from your computer. Then click Upload to upload it.
    6. Click Confirm to save changes.

When you make a change to any of the aforementioned fields a Warning message will pop-up asking you to restart the machine. Click OK for the changes to take place. Wait a few seconds and you will be prompted again at the login screen.To login, type again admin to both the Username and Password fields, unless you changed the credentials manually.

The phone is now configured for use with OpenScape Cloud.


You can verify that the phone is successfully registered to OpenScape Cloud either from the web interface or the device’s screen, as follows:

  • At the web interface, navigate to Status and check the section Account Status. The Account1 should have its indication Registered.

  • At the device, you should be able to see solid black phone icon on the phone’s LCD screen which indicates that the device is successfully registered.

  • Place a call from and to the phone and make sure that the call is established.

If the phone is not successfully registered, please check your settings and network connection.

Further information

The following functionality has been tested:
  • Answer incoming call, reject incoming call, accept call, dial a number, do blind transfer, attended transfer, consult transfer, merge calls/conference, send DTMF (i.e. Dual-tone multifrequency signaling), hold and resume a call and show SIP display name are supported by the phone.

  • The following functionality has been tested with Circuit client in remote call: move call between phone and Circuit client(s), i.e. pull call from phone to Circuit client and push call from Circuit client to phone, answer incoming call, make a call, merge calls, transfer call, consult, and hold and resume a call via Circuit.

Please understand that some of the features the phone device might offer with other platforms, like for example MWI notifications, might not be offered with OpenScape Cloud.

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