Q. Which SIP method initiates a session in IMS?
a) BYE
b) REGISTER
c) INVITE
d) OPTIONS
Check 🔎
Correct answer: Letter c.
In IMS (IP Multimedia Subsystem), a SIP INVITE method is used to initiate a session, such as a voice or video call. It starts the session establishment process between two user agents.
Q. Which SIP method initiates a session in IMS?
a) 
“BYE”
→ Incorrect. BYE terminates an active session.
b) “REGISTER”
→ Incorrect. REGISTER is used for registering with the network, not for starting sessions.
c) 
“INVITE”
→ Correct. INVITE initiates a SIP session in IMS.
d) “OPTIONS”
→ Incorrect. OPTIONS queries capabilities, but doesn’t start a session.
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