How to raise your own secure audio channel?

Question

Telephony

Hello.
Tell me how you can raise your own secure audio channel?
Let me explain: we are not talking about absolute protection, it is clear that if necessary, they will hack. It's just unpleasant that any cook who has seized control of the state seeks to satisfy unhealthy curiosity at my expense.
Now they write that messengers have compromised themselves. Is there any open source voice messenger that can be installed on a remote server? Well, it seems like they are doing OpenVPN for themselves now, or something like that.
Thank you.

Answer 1

Why don't you like OpenVPN?
raise an encrypted channel and send anything over it - irc/jabber or teamspeak/etc..