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Accessing the Network
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The first step in establishing a session is getting access to the network. While this is really outside the scope of this book, I have included this discussion to clarify what takes place prior to SIP being engaged. When a device is activated, it must first seek a network connection. On a PC, the network card looks for a connection through either the Ethernet card or the WiFi adapter. If it senses a carrier (and hence a connection) on either one, it exchanges IDs with the network provider to obtain an IP address. The IP address is typically allocated dynamically. In other words, you are not usually assigned a fixed IP address, but the first IP address available at the time. This avoids using up all of the IP addresses available, and it allows you to change locations without having to be concerned about your IP address. In fact, the network has the ability to discover your IP address as you begin using the network. The Dynamic Host Configuration Protocol (DHCP) is used to obtain an IP address from the network server. This is done over the IP network. Once you have obtained your IP address, you can then begin using applications on our device for communications. The applications you use will determine what protocols are used for session control. For example, when you launch your Web browser, you are using HTTP to access Web sites. If you launch a communications application that is SIP enabled, you will immediately begin using SIP to set up sessions and communicate with other users. The IP address that you obtained from the network stays assigned to your device as long as you maintain the connection. In some cases, however, you may move from one location to another. This is where wireless comes into play. WiFi does not support roaming, so when you wander outside the range of your access point, you lose your connection (as well as your IP address).
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Establishing a Session in SIP
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WiMax, on the other hand, does support roaming, so as you move from one location to another, your IP address is re-assigned based on availability, but your connection is not lost. The connection is maintained throughout the handoff. This is the same concept used in cellular networks. The IP connection does not connect you to any one network necessarily. It may be just a public network you are connecting into, so you may have to connect into your local service provider network to be able to use services. For example, you may have an account with Google, in which case you will need to log on to the Google network to be able to access your account and use their services. Typically, if you are connecting into a VoIP network, you will connect with a local media gateway controller (MGC) that services your area. The MGC is able to communicate with devices via SIP and may even use SIP to communicate to other MGCs. It is my own personal viewpoint that all networks will migrate to SIP and may also even implement the IMS as an architecture for implementing their SIP networks. The IMS architecture is defined by the 3GPP for implementing SIP in a communications network. It calls for call session controllers deployed in such a fashion as to support many of the processes and procedures already being supported in GSM networks today. The IMS is defined in my other book, The IP Multimedia Subsystem: Session Control and Other Network Operations (McGraw-Hill, 2007). Even with the IMS, the first step is accessing an IP network and obtaining an IP address. This means that someone (the local telephone company) is going to have to be in the business of providing these connections to our homes and businesses. The connection is maintained as long as the device is active. However, the connection does not mean any sessions are established. Sessions are only established when your device or any other device wishes to communicate with another device. When devices are ready to communicate, they must form a virtual connection. This is referred to as a dialog in SIP terms. The dialog allows the devices to exchange data between one another and is maintained as described in the next section.
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