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  This package contains the interfaces representing SIP messages. There are 
two type of messages, namely Request and Response: 		                   
  • Request - these messages are sent from the client to server. They contain a specific method type that identifies the type of Request, a Request-URI which indicates the user or service to which this request is being addressed, along with various Headers and Body that make up the content of the Request.
  • Response - these messages sent from server to client in response to a Request. They contain a specific status code that identifies the type of Response, a Request-URI which indicates the user or service to which this request is being addressed, a reason phrase that is intended for the human user, along with various Headers and Body that make up the content of the Response.
Messages may contain multiple Headers and multiple Headers of the same type. The order of all Headers within a message is significant, i.e. Headers which are hop-by-hop must appear before any Headers which are end-to-end. A message Body contains a session description . This format is represented as an Object in this specification, which allows the body to be a String or an Object type defined the Session Description Protocol (SDP) specification.

Additionally this package contains a MessageFactory class that defines methods for creating new requests and responses. The MessageFactory is a singleton object, which can be obtained from the {@link javax.sip.SipFactory}.





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