3) Can anyone explain the meaning of "peer", "friend", "user" in more details? For each case, what is the role of Asterisk in SIP world, a UA, a proxy, or others?
In some diagrams, Asterisk take's the role of a SIP Proxy, but it is *not* a SIP proxy by design. Asterisk answers SIP calls and originates calls as just another SIP user agent client/server.
Asterisk is also acting as a SIP registrar, keeping track of where SIP ua's are so we can place calls to them ([peer]s).
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