| The telecommunication service is developed swift and violently atpresent. The concept and system of traditional telecommunications arefaced with new technical revolution represented by Internet. Thetelecommunication industry is facing a great change. The new businessappears quickly, the service of the data is being developed fast, theportfolio of the data expands rapidly. With the development of the networktechnology and changes of market demand, the new subject that thetelecommunication Co. faces is how to fully utilize resources of thealready existing network and paces keeping up with the gradual progressof the network.SIP is a control stack over application layer. SIP can be used to call,revise, and stop the conversation of the multimedia (or the meeting).Recently, a very obvious change has happened during the development ofthe NGN. A lot of equipment manufacturer favored SIP stack on the agreementstandard of networks, including Cisco, North Telecom who have made greaterimprovement. SIP has great advantage because of simple, comparing withH.323 standard. This is why many Co. select SIP. When IP and multimediahave already become the irreversible trend, SIP is got and pursued is thething in the reason. At the same time SIP has succession, compared tooperator with traditional network, SIP is undoubtedly a breakthrough pointforming a connecting link best while the network develops.The industry has been thrown into various kinds of network applicationabout SIP with great enthusiasm, and has put forward the solution thatsome models use. Also they provide the mechanism of SIP agreement. SIPcomplies with the general principle of Internet, and it is a client / serverstacks. The Proxy is basic net unit of SIP network, who finished callingout and selecting the way to transmit the function. |
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