Which of the following is NOT a SIP protocol feature?

The correct answer is D. A transmission-layer protocol. SIP (Session Initiation Protocol) operates at the application layer (Layer 7) of the OSI model, not the transmission layer (Layer 4) - making D the correct answer. The transmission layer is the domain of protocols like TCP and UDP, which SIP actually uses as its underlying…

Question

Options

AResponsible for creating, modifying, and terminating sessions
BBased on IP network
CA text-based protocol
DA transmission-layer protocol

How the community answered

(42 responses)

A
17% (7)
B
2% (1)
C
7% (3)
D
74% (31)

Explanation

SIP (Session Initiation Protocol) operates at the application layer (Layer 7) of the OSI model, not the transmission layer (Layer 4) - making D the correct answer. The transmission layer is the domain of protocols like TCP and UDP, which SIP actually uses as its underlying transport.

Options A, B, and C are all genuine SIP characteristics: SIP's core purpose is precisely to create, modify, and terminate multimedia sessions (A); it runs over IP networks, hence the "IP" in its name and ecosystem (B); and like HTTP, SIP uses human-readable text-based messages for signaling (C).

Memory tip: Think of SIP as "the HTTP of phone calls" - just as HTTP is an application-layer protocol that rides on top of TCP, SIP is an application-layer protocol that rides on top of TCP or UDP. Neither one is a transport protocol; both use them.

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