Figure 5-6 An example of a SIP-enabled service in Visual Studio .NET

Encoder Data Matrix in Visual Studio .NET Figure 5-6 An example of a SIP-enabled service

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than is found in typical telecommunications protocols That flexibility can be exploited to enable custom services and features SIP messages can include a number of optional fields, which can contain user-specified information This approach enables users to share nonstandard user-specific information, which enables users and devices to make intelligent call-handling decisions For example, a SIP INVITE can include a subject field A person who receives an INVITE might decide to accept or reject the call depending on who is calling and what the subject happens to be One can imagine a situation where an INVITE contains a text string such as I know you are there Please answer the phone If the call is rejected, the response might contain a text string such as Stop calling me! Imagine another scenario where a call is directed to a user who is currently not available Obviously, the SIP response will indicate that the user is unavailable (no big surprise) The response could, however, include an indication that the user expects to be available again at 4 PM In such a case, the calling terminal could do two things First, the terminal could tell the calling party that the called user expects to be available at 4 PM Second, at 4 PM, it could ask the caller if he/she wants to make the call again and, if so, the terminal can automatically set up the call Such a scenario is shown in Figure 5-6 This is a clever and simple mechanism in the IP world of providing a call-completion service, similar to the Call Completion to Busy Subscriber (CCBS) of the telephony world It is also a lot more effi-
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Figure 5-6 An example of a SIP-enabled service
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a b c d e f g h i j BYE OK ACK Conversation ACK INVITE Ringing OK INVITE Busy (Try at 4pm)
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The Session Initiation Protocol (SIP)
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The Session Initiation Protocol (SIP)
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cient than calling back every 15 minutes in the hope that the person will finally answer or paying the telephone company to keep trying to connect the call The foregoing are some simple examples of capabilities that SIP offers Since SIP provides many pieces of information for inclusion in messages, and because additional, nonstandard information can also be included, the opportunity exists to offer numerous intelligent features to subscribers Moreover, the control of those features is placed in the hands of the customer No longer does a customer need to subscribe to a particular feature and have that feature actually controlled by the network operator The following sections of this chapter are devoted to describing the fundamentals of SIP From this description, the reader should gain a good understanding of how SIP works, how it compares to other standards (such as H323), and how it can be used to provide new and advanced features to users
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Overview of SIP Messaging Syntax
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As mentioned, SIP is a signaling protocol As such, it has a particular syntax In the case of SIP, the syntax is text-based, using the International Organization for Standardization (ISO 10646) character set, and has a similar look and feel to the Hypertext Transfer Protocol (HTTP) One advantage of this approach is that programs designed for the parsing of HTTP can be adapted relatively easily for use with SIP One obvious disadvantage, compared to a binary encoding, is that the messages themselves consume more bandwidth SIP messages are either requests from a client to a server or responses (which are also known as status messages) from a server to a client Each message, whether a request or a response, contains a start-line, possibly followed by headers and a message body:
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message = start-line *message-header CRLF [message-body]
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