TLS (Transport Layer Security) offers a way to encrypt SIP (Session Initiation Protocol). The main advantage of this is the ability to allow mobile devices to connect to the QuBePBX.

Below are several documents to help guide the process of setting up TLS.

TLS Setup for QuBePBX
TLS Setup for Yealink Phone
TLS Setup for Certificate on Windows
TLS Setup for Bria Desktop Version
TLS Setup for Bria Mobile Version