Encrypt media streams. As is the case with signaling-based attacks, transport attacks also rely on the plaintext format of VoIP traffic. Specifically, if an attacker has the ability to intercept valid packets traveling over the network, forging malicious RTP/RTCP packets and inserting them in the media stream becomes trivial. Even if the attacker does not have access to the media stream, creating rogue RTP packets that appear legitimate is not a difficult task, given that the attacker has some information on the peers involved in the target communication. The solution for protecting RTP/RTCP media streams against media eavesdropping attacks is the introduction of encryption mechanisms. The SRTP and SRTCP protocols, which offer confidentiality, message authentication, and replay protection, represent the standard for providing VoIP transport-level security.
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