Overview of setting up a TangoPBX or FPBX system for using encrypted signaling and media with Clearly phones.
Summary
TLS Certificate
Asterisk Configuration
PJSIP extension(s)
TLS Certificate
A proper TLS certificate is required. A cert issued by Let's Encrypt (LE) is a solid free option, but you can also upload a TLS certificate using the Certificate Management module. For details on how to install and use the Certificate Management module for adding a TLS cert to your PBX, see
this wiki page. A system configured with a single TLS certificate should have that cert be set to the default.
On the PBX admin portal, browse to Settings -> Asterisk SIP Settings
Uploading ....