Okay, let's see. INVITE and re-INVITE make sense, since they're the main ways to establish a new dialog. REFER and REGISTER are more for other SIP functions, so I'll go with A and B.
Hmm, I'm not totally sure about this one. I know INVITE is used to initiate a new session, but I'm not certain about the other method. I'll have to think it through carefully.
I'm a bit confused on the differences between these SIP methods. I'll have to review my notes to make sure I understand which ones are specifically used to create a new dialog. Better play it safe and not guess.
This is a classic SIP question. INVITE and re-INVITE are the obvious choices. I bet the next question is going to be about the differences between them.
Hmm, I'd say INVITE and re-INVITE are the correct answers. REFER is used for transferring calls, not creating new dialogs. And REGISTER, well, that's just for registration purposes.
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