Which of the following is a secure protocol?

a. SIP
b. H.323
c. SSIP
d. RTP

c. SSIP
Explanation: A secure version of SIP has been developed called SSIP, which provides for end-to-end secure communications by requiring user authentication. H.323 works with delay-sensitive traffic (for example, voice and video) to help establish a priority for timely packet delivery, critical for real-time applications. A Real-Time Protocol (RTP) header is added to frames and includes the Packet sequence number and timestamp.

Computer Science & Information Technology

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