Webphone in UCPa

Dear Community,

after a new installation with version 17 i want to give it another try with the webphone on the UCP.
I already enabled the plugin for a user and it showes up. As i know that a https connection is nessesary i’m stucked to get it working.

I only want to use it in our internal network, and i’m not sure if i need a “let’s encrypt” or a self signed" certificate for it and what i do after it.

I tried it in the past but after enableing the certificate i could not reach the GUI anymore i want to avoid this situation again.

I only found this instructions which refer to a older FreePBX i think?
https://sangomakb.atlassian.net/wiki/spaces/PG/pages/38634428/WebRTC+Phone-UCP

Did exist a newer one i can use?

Thank You
Stefan