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SIP was derived from the Hypertext Transport Protocol (HTTP), so you will see many aspects of the SIP protocol that resembles HTTP. It is text-based, which makes it simpler to understand than most bit-oriented protocols. In a bit-oriented protocol, you must know the significance of each bit position according to the rules and syntax of the defined protocol. There are also some aspects of SIP derived from the Simple Mail Transport Protocol (SMTP). You will see aspects of this in the SIP headers and parameters described in this chapter, as well as in the routing of the SIP messaging through the network. It is important to understand that a SIP entity is not a physical thing. SIP entities are logical. Indeed, a physical entity such as a server may support several logical entities. Each SIP network entity must be capable of processing SIP messages in stages, referred to as layers. Not every SIP entity is capable of all of the layers; depending on the entities functions, there may be no need for some of the layers. All SIP entities must be able to support the first two layers. The layers are defined as:

The WSDL message element and part element definitions have a significant effect on SOAP binding. This effect will be discussed later. The WS-I Basic Profile further emphasizes that the element attribute and the type attribute of the port element must not be used at the same time. In other words, these two attributes are mutually exclusive.

mission to educate herself on antiques and collectibles of all sorts so she could learn which items to purchase for resale on eBay. With the promotional cars, I had tons of collectors e-mailing me for more information. In the process I learned all about them. I knew that if I could learn about these things and sell them and make a big profit, I could sell other things. I built up a huge reference library on anything and everything I could get my hands on. Even today, I am constantly buying new books, taking classes on antiques and collectibles, and watching any and all shows on decorative arts in order to learn more. It s easy to see how Melissa s research has paid off. As you can tell from scanning the list of items currently for sale in her eBay Store, Sandso-Time, she has anything and everything for sale, from an ivory carved miniature to a piece of rhinestone jewelry (see Figure 4-2).

The operation element is a direct child of the portType element. (The portType element will be described later in this section.) A portType can contain any number of operation elements. An operation is an abstract description of a service call and therefore describes the set of abstract messages exchanged between the service client and service provider for executing a call. Four different types of operations can be defined in WSDL. These types of operation are differentiated by their ordering and the presence of input, output, and fault messages. The four types of operations are summarized in Table 13.5. For Web Services, only two of these types are important: the request/ response type operation and the one-way type operation. The WSDL specification defines SOAP bindings for these two types only. The containment structure of the request/response type and the one-way type of operations are depicted in Figure 13.3.

Syntax and encoding is the lowest layer defined in the SIP protocol Syntax and encoding is essential to understanding and interpreting or processing any SIP message, so this is mandatory for all network entities This is best defined as the set of rules that defines and constitutes the format and structure of each of the SIP messages In short, it allows the entity to understand and interpret SIP messages For example, when a SIP message is received by a network entity, it needs to know the difference between the various message types, and where the parameters begin and end for each message header This is part of the syntax and encoding responsibility The transport function is a very basic process within every entity that supports the need to create a message and send it through the network to another entity All SIP entities have a transport layer.

FIGURE 4-2 This seller is constantly researching and educating herself so she can sell more effectively.

Four Types of Operations Supported by WSDL Description In this type of operation, the service end point receives a message and sends a correlated message back. It contains one input element, one output element, and, optionally, one or more fault elements. The ordering of these elements is signi cant. In this case, the service end point just receives a message and there is only an input element specifying the operation. The service end point sends a message and there is only an output element specifying the operation. In this case, the service end point sends a message and receives a correlated message. There is an output element, an input element, and, optionally, one or more fault elements. The order of these parameters is signi cant. Request-response Operational 1 input 1 output n definitions fault