Asterisk 11 TLS + ZRTP

I’m working on an asterisk 11 project with TLS + ZRTP security.
What I want to ask, how to install and configure ZRTP in asterisk 11?

thank you and please help

Asterisk 11 is a year past end of life. I don’t think any official version of Asterisk support ZRTP. Contact the supplier of the ZRTP patch.

where can I find a supplier for the ZRTP patch?

Sorry, I assumed you had one already. I don’t know for certain that there is one, so the answer is Google.

Hello, did you find a solution how to transfer ZRTP through Asterisk between two clients?