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SIP uses an offer/answer mechanism for establishing a session. This means that any entity wishing to establish a connection with another entity must first initiate an offer (the offer contains the parameters for establishing the connection, such as resources required). The receiving entity must then answer the offer, either accepting or rejecting the offer. The user agent client (UAC) function within the device is responsible for initiating an offer. The UAC, remember, is a function resident in all network entities capable of establishing and participating in sessions. The offer is made to the user agent server (UAS) function at the destination device. If the UAS is going to accept the offer, it will send an answer back to the UAC, which will then return an acknowledgment to the UAS. The final act of sending the acknowledgment is what establishes the session. A session is a logical connection between two entities wishing to communicate. There may be multiple devices involved in any one session. For example, in a conference call
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there are multiple recipients of a session offer. Each of the recipients must send its own answer to the offer. Each of the answers must be managed separately to maintain the status of each of the participating entities. The offer must also contain details about the session itself. These details include any resources such as codecs that must be provided and media types to be supported. The details may also include addresses where certain aspects of the session can be learned. This information is contained within the Session Description Protocol (SDP) carried by the offer. To communicate the various aspects of a session with one another, the participating entities must establish a unique dialog. This is also a virtual connection between each of the recipients and the originator of the offer. The originator of the offer will maintain a separate dialog with each of the participants. When two devices communicate with one another, they exchange a set of messages (referred to as transactions). For example, a cell phone originating a call to another cell phone would send an INVITE to the other phone requesting a connection be made. The recipient of the INVITE will determine whether to accept or reject the transaction. If the cell phone chooses to accept the invitation to a session, then it will send a response to the request and exchange other messages entering into a dialog with the other device. The dialog then becomes a logical connection between the communicating entities for the purpose of exchanging SIP messages regarding a session. Only INVITE, SUBSCRIBE, and REFER will lead to the creation of a dialog. Each user agent establishes its own dialog with the user agent client (the requestor). The dialog is then used by the user agent to maintain the status of the dialog and associated sessions. The session is not the same as a dialog, since a session can involve multiple user agents communicating with one user agent client. In other words, the dialog is established between each entity involved in the same session, as depicted in Figure 5.1. The illustration shows the user agent client with a dialog established with multiple user agent servers, exchanging session control information for the same session (as would be the case in a conference call). As can be seen in the figure, the user agent client can now delineate transactions between each of the entities participating in the same session. This allows the UAC to correlate responses from each individual UAS and treat each one independently even though they are all participating in the same session. Each dialog requires a dialog ID, which is derived from the SIP headers. When the UAC sends a request for a session, it will expect a response. In that response will be required headers (as we will discuss in a moment). The response must contain the TO, FROM, and CALL-ID headers. The TO and the FROM headers will include the TAG parameter. The TAG parameter is used by each user agent for correlating requests with responses, but it is also used for calculating the dialog ID. The dialog ID then becomes unique for the UAC and each of the UASs. In other words, the UAC creates its own dialog ID, while each of the UASs will create its own unique dialog ID. This is not communicated to other entities, since the use of the dialog ID is local (used by the user agent).
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