(1)The lowest layer of SIP is its syntax and encoding. Its encoding is specified using an augmented Backus-Naur Form grammar (BNF).
(2)The second layer is the transport layer.
(3)The third layer is the transaction layer.
(4)The layer above the transaction layer is called the transaction user(TU). Each of the SIP entities, except the stateless proxy, is a transaction user.
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