GSEC · Question #39
Which of the following SIP methods is used to setup a new session and add a caller?
The correct answer is D. INVITE. In SIP, the INVITE method is the specific request used to initiate a new multimedia session, conveying the caller identity and session parameters to the called party.
Question
Which of the following SIP methods is used to setup a new session and add a caller?
Options
- AACK
- BBYE
- CREGISTER
- DINVITE
- ECANCEL
How the community answered
(23 responses)- A4% (1)
- B13% (3)
- D78% (18)
- E4% (1)
Why each option
In SIP, the INVITE method is the specific request used to initiate a new multimedia session, conveying the caller identity and session parameters to the called party.
ACK confirms receipt of a final response to a previous INVITE transaction and does not itself initiate or add a new session.
BYE terminates an established session by signaling that one party wishes to end the call, not set one up.
REGISTER associates a user agent's current contact address with its address-of-record at a registrar server and is not used to establish a media session.
RFC 3261 defines INVITE as the SIP method that indicates a user or service is being invited to participate in a new session, carrying session description information (typically via SDP) and identifying the calling party. It is the foundational request that triggers the SIP dialog and negotiates media parameters for the call.
CANCEL is used to abort a pending INVITE that has not yet received a final response, which is the opposite of setting up a new session.
Concept tested: SIP INVITE method for new session setup
Source: https://datatracker.ietf.org/doc/html/rfc3261#section-13
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