Does SRTP provide encryption that prevents a middle-man from viewing SIP traffic in plain-text?

Secure Real-Time Transport Protocol (SRTP) indeed provides encryption, but it's important to clarify its relationship with Secure Internet Protocol (SIP) traffic. While SRTP is designed to encrypt the media streams of voice data being transmitted, it does not apply encryption directly to SIP signaling itself. Therefore, while the media (like voice or video) is secure due to SRTP, the SIP messages that set up and control these calls can still be viewed in plain-text by any intermediary in the network path unless those messages are secured using a different protocol such as SIP over Transport Layer Security (TLS).

This means that SRTP can effectively protect the confidentiality of the media stream itself, preventing a middle-man from eavesdropping on the content of voice communications. However, since the SIP messages are unencrypted without additional protections, claiming that SRTP alone prevents a middle-man from viewing SIP traffic in plain-text is inaccurate.

In contrast, the other options suggest contexts or conditions where SRTP might provide encryption, but they misrepresent how SRTP functions in relation to SIP encryption, making them less accurate in this scenario.