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Posted by john_pederson

SIP is a client server architecture.The client in this architecture is user agent(UA).The UA interacts with the user.It usually has an interface towards the user in the form of personal computer or IP phone.And in the architecture basically four types of SIP servers could be used.
1.)user agent server
2.)proxy server
3.)Redirect server
4.)Registrar

The type of server used determines the architecture of the network.

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Posted by sagitraz