In order to allow your users to have an almost zero config setup of your Windows softphone you can pass installation parameters with MSIX and App installer. The example below is given with our Generic Softphone but you can change the base url for your own Whitelabel apps.
If the app is located at the following url you can pass parameters as shown below
https://windows-softphone.s3.eu-west-2.amazonaws.com/sessioncloud.appxbundle
With parameters
ms-appinstaller:?source=https://windows-softphone.s3.eu-west-2.amazonaws.com/sessioncloud.appxbundle&activationUri=scsc:?username=joe:callbox%26password=bloggs
Of course username and parameters should be actual ones.
So you can just add the above to an html button in an email
<a href=”ms-appinstaller:?source= https://windows-softphone.s3.eu-west-2.amazonaws.com/sessioncloud.appxbundle&activationUri=scsc:?username=joe:callbox%26password=bloggs”/>