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Now that we have covered establishing a SIP session, let s look at how SIP requests and responses are routed through the network. A unique feature of SIP is its ability to locate a subscriber anywhere in the network. This form of mobility is something that is lacking in switched networks, and what has helped increase the popularity of IP-based telephony. Mobility is an important capability in modern communications, allowing users to receive their phone calls, e-mails, and other communications no matter where they are, as long as they have a network connection. With the advent of 3G/4G wireless and WiFi/WiMax wireless, users can now be connected most anyplace. Since many of us have multiple devices, we also have multiple identities (as discussed in 2). Each of our devices carries an identity, which is important when routing because these addresses must be located for proper routing. This is why SIP uses the concept of URIs, which can be resolved to an actual IP address using the Domain Name Server (DNS). The DNS resolves the URI found in the request-URI of the message into an actual IP address that can then be used for routing to an actual device. If a TEL URI is used, then the ENUM function is queried to resolve the TEL URI to a domain name, which is then resolved by the DNS into an IP address. So you can see that from the offset there are a number of messages traversing the network just to determine how to route a SIP message to its destination. However, this

In publish-and-subscribe messaging, one producer can send a message to any number of consumers through a virtual channel called a topic. Consumers can choose to subscribe to a topic. Any messages addressed to a topic are delivered to all the subscribers. Every subscriber receives a copy of each message, as shown in Figure 6.5. The publish-and-subscribe messaging model is mostly a push-based model, where messages are automatically broadcast to consumers without the topic being polled for new messages. In the publish-and-subscribe messaging model, the publisher may not care if everybody is listening, or even if nobody is listening. For example, consider a publisher that broadcasts stock quotes. If any particular subscriber is not listening and misses out on a great quote, the publisher is not concerned. Messages A message consists of a header and a body. The body contains the data to be processed by the receiving application. The header contains the message identification and control information, intended to be used

2

whole concept of the URI is what enables mobility, since users can change their locations at any time, and hence change their physical addresses anytime, without losing the ability to be reached by other users. In the next example you see the method INVITE with the request-URI in bold. The domain tcg.com has to be resolved into an actual IP address at some point, to reach its destination.

mostly by the messaging system. A typical header would have a number of attributes. Some of the commonly occurring attributes are

Message ID/correlation ID Persistent/nonpersistent Return address Priority Segmenting/grouping information Date and time Lifetime of a message Version

INVITE sip:travis.russell@tcg.com sip/2.0

Having a mission is very important, says Pam Thien. Pam is a PowerSeller on eBay. But selling jewelry made by indigenous people in Thailand on eBay and through her web site Shiana.com (http:// www.shiana.com) is only a part of what she and her family do. Not everyone is going to be willing to trek into the remote countryside of Thailand to find beautiful silver creations made by a remote hill tribe who are struggling to support themselves, after all. Not everyone is going to resell the jewelry online and donate profits back to the silversmiths, either. But no matter what you plan to sell on eBay, it is important to ask yourself: Why do you want to sell on eBay What do you want to accomplish It s important to have a mission for your business, whether the business is on eBay or not. The most successful PowerSellers believe in what they are doing. They feel passionately about their mission and will do everything they can do achieve it. If customers know you have values and beliefs, you ll not only have the satisfaction of doing the right thing, but you ll attract more business. Even if you only plan to sell everyday household items from the comfort of your home, you can learn a great deal from the story of Pam Thien and her family.