Can You Explain The Structure Of Sip Protocol?

1.	Can You Explain The Structure Of Sip Protocol?
Answer» The SIP protocol is divided into layers. The lowest layer of SIP is its syntax and encoding, where the message is constructed. The The second layer is the transport layer, it defines how a message is send and receive over a network. The THIRD layer is the transaction layer. A transaction is a request sent from the UAC to UAS and the RESPONSES for this request COMING from UAS to UAC.The transaction layer handles application-layer retransmissions, matching of responses to requests, and application-layer TIMEOUTS. 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.

Answer»

The SIP protocol is divided into layers.
The lowest layer of SIP is its syntax and encoding, where the message is constructed.
The The second layer is the transport layer, it defines how a message is send and receive over a network.
The THIRD layer is the transaction layer. A transaction is a request sent from the UAC to UAS and the RESPONSES for this request COMING from UAS to UAC.The transaction layer handles application-layer retransmissions, matching of responses to requests, and application-layer TIMEOUTS.
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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