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Get your SIP registration details for the device line; more information can be found here.
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Download the latest version from here.
Install the program and open it.
Open the 'Settings' window.
Click on the dropdown to open the menu.

Select 'Settings'.

From the 'Settings' window, ensure that the 'Enabled Codecs' are shown as below.

Leave everything else as default and click 'Save'.
Click on the dropdown menu again and select 'Add Account'.
Example of a device line.

1. SIP Server = **SIP Server / Proxy**
2. SIP Proxy = **SIP Server / Proxy**
3. Username = **Account / Username**
4. Domain = the SLD (last) part of the SIP Server / Proxy domain, in this example nebryexample.com
5. Login = **Account / Username**
6. Password = **Password**

Set the 'Media Encryption', 'Transport' and 'Register Refresh' as below.

Leave everything else as default and click 'Save' when ready.

Extension should now be registered and reachable.