The below procedure describes how to set another software by default when using the CallTo: and Tel: protocols.
Prior Microsoft Windows 10
Navigate to “Control Panel\All Control Panel Items\Default Programs\Set Associations” and select “Associate a file type of protocol with a program”.
Navigate to the protocol to update and select “Change Program…” Select then the new software to associate with the protocol.
Microsoft Windows 10
Download the sample registry script here and edit it with a text editor. Replace CiscoJabber and the corresponding path with the software to be associated with the DialTo: CallTo: protocols.
Change default Dialer for CallTo: and Tel: Protocol