Cyber security library usage in asterisk

We have a requirement to make VoIP calls secured by encrypting the ongoing calls and decrypted
What is the way to do that in asterisk ?
Can we use any third party cyber security library in asterisk ?
We can means, where can we modify the code for incoming / outgoing VoIP calls to include the library in asterisk code ?

Both SIP channel drivers in Asterisk support TLS for encrypting the signaling. For RTP both SDES-SRTP and DTLS-SRTP are supported.

If this isn’t enough then there is no easy guide to modifying things further, and the definition of securing VoIP calls can also differ. In Asterisk calls do not traverse the core encrypted.

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