I developed an application with Intel XDK for internal use in local network, which is responsible for listing all extensions of the company, I would implement in the click of the list items the functionality of calling the extension using SIP technology - Session Initiation Protocol.
In short, the user clicks on the list item and the application calls the extension
I found references on the internet, but the documentation that did not help me much.
SIP technology references;
JsSip - link
sipML - link