Which three statements are true about SIP, per RFC 326? (Choose three.)
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A. B. C. D. E.CDE.
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A) SIP does not provide for resource reservation: This statement is true. SIP (Session Initiation Protocol) is a signaling protocol used for initiating, maintaining, and terminating real-time sessions that involve video, voice, messaging, and other communications applications. However, SIP does not provide for resource reservation, meaning that it does not reserve bandwidth or other network resources in advance to ensure quality of service (QoS) for real-time communications. Instead, SIP relies on other protocols like RTP (Real-Time Transport Protocol) and RTCP (RTP Control Protocol) to manage QoS.
B) SIP defines native methods for negotiating media streams: This statement is true. SIP does define native methods for negotiating media streams between the parties involved in a session. For example, the INVITE method in SIP is used to initiate a session, and it includes an SDP (Session Description Protocol) message that describes the media streams to be used in the session.
C) A SIP transaction occurs between a client and a server: This statement is true. In SIP, a transaction refers to a request from a client to a server and the corresponding response from the server to the client. A SIP transaction occurs between a client and a server and involves a request and a response. For example, a SIP INVITE request is sent from a client to a server, and the server responds with a SIP 200 OK response.
D) To set up a voice session, SIP relies on protocols such as SDP and RTP: This statement is also true. To set up a voice session, SIP relies on protocols such as SDP (Session Description Protocol) to describe the media streams to be used in the session, and RTP (Real-Time Transport Protocol) to transport the actual media (audio or video) between the parties involved in the session.
E) SIP signaling can only be used for voice over IP thereby limiting its use as a general signaling protocol: This statement is false. While SIP is commonly used for voice over IP (VoIP), it is not limited to VoIP and can be used for other types of real-time sessions, such as video, messaging, and presence. SIP is a general-purpose signaling protocol that can be used for a wide variety of real-time communication applications.