SIP - the start standard, and Skype : closed. But Skype adapts meant for real conditions better, SIP it will be focused on conditions kinfolk to ideal. Report GLASS, Session Interaction Protocol (RFC 3621) is open utilizing a cavity for developers. It(he) is very well thought over, and today moment is the best as it is simple enough for hardware realization together with, besides the organization regarding voice sessions of communication(connection), offers a number(line) of additional prospects. Into problems(tasks) of report SIP enters to establish and coordinate communication(connection), in addition to being not necessary that this specific communication(connection) was voice is there could be any stream of the data in real time - video, the multi media data, interactive service. Commands(teams) belonging to the report remind HTTP, up to separate details. Key offer SIP is client - server opiented. Here it will be meant, that at any community of a SIP-telephony you will find a server (GateKeeper). Report GLASS is well focused regarding work in local systems and on good Web-based - channels. But and what will take place when the online world - п р о в а й д е р on the amount or the reasons will not wish, that users could do bells through SIP? For achievement belonging to the purpose to it "will cut" sufficient UDP packages with cost of port 5060 which SIP has ceased to be effective normally. There are tips on how to avoid a similar arbitrariness, it also intervention in work within the report demand, forcing to lose interest in compatibility with the common equipment. The report used Skype always was and is constantly on the remain closed from unusual developers. It has availablility of features which distinguish that from SIP. First, report Skype concentrates on a p2p-network (Peer-To-Peer. ) Skype operates a principle self-organizing distributed(allocated) p2p networks wherein there are no continuous servers. The role of servers is undertaken by the participants of your network having direct IP-address along with the wide channel of link with the Internet. Second, on report Skype enciphering will be without fail applied. It does not take compelled measure caused simply by p2p-structure of network Skype: the traffic passes through units to that will not trust. Thirdly, Skype comes with the high resourcefulness allowing it(him) to the office even on limited connections for the Internet. Skype it concentrates on the broad audience of users on the different countries and interventions in work from the network with the motive to forbid VoIP to get him(it) are less unpleasant, because it(he) is prepared for this purpose. It is known, that report Skype has capability find ways to move the voice information. Just like, if the necessary selection of ports of report UDP is actually closed (usually report Skype applies port UDP 40150), Skype is switched to utilise of free TCP-ports, up to obviously open 80 kindoms (HTTP), and if it is very important, will use connection with HTTP-proxy. It means, that Skype are appropriate practically everywhere where World wide web - sites "open". You can get bases to consider, that Skype uses the modified version belonging to the standard SIP-report. In some other words, SIP was taken for that basis of report Skype in addition to being modified, due to what Skype offers competitive before operators of your SIP-telephony - cheapness assistance a user's network and capacity to work almost everywhere and in any conditions.
