Question

What is the recommended secure protocol for voice and video applications? secure real-time transport protocol (srtp) hypertext transport protocol secure (https) network time protocol (ntp) secure/multipurpose internet mail extensions (s/mime)?

Answer 1

The recommended secure protocol for voice and video applications is the Secure Real-time Transport Protocol (SRTP) protocol. SRTP is a Real-time Transport Protocol (RTP) profile used to  to provide encryption, message authentication and integrity.
The default cipher of SRTP is the Advanced Encryption Standard (AES) .