Jami Android SIP account TLS & SRTP options

I can’t seem to find any instructions for and/or explanation of the SIP accounts TLS & SRTP options, etc. in the ‘Security’ tab. The app connects to my Telnyx account until I try to enable TLS & SRTP. Please advice…

TLS is enabled by default.


What is this slider for then?
Anyway, with TLS & SRTP disabled the connection succeeds, with them enabled it fails. There are many more options available but no explanation or instructions anywhere what they are/do or how to set them. Any suggestions?

I am not sure how SIP is configured.