| SIP - the open standard, and Skype - closed. | | | | developers. It has number of features which |
| But Skype adapts for real conditions better, | | | | distinguish it from SIP. |
| SIP it is focused on conditions relatives to | | | | |
| ideal. | | | | First, report Skype is focused on a |
| | | | p2p-network (Peer-To-Peer.) Skype works by a |
| Report SIP, Session Interaction Protocol (RFC | | | | principle self-organizing |
| 3621) is open by a cavity for developers. | | | | distributed(allocated) p2p networks in which |
| It(he) is well enough thought over, and at | | | | there are no constant servers. The role of |
| the present moment is the most popular as it | | | | servers is carried out by the participants of |
| is simple enough for hardware realization | | | | a network having direct IP-address and the |
| and, besides the organization of voice | | | | wide channel of connection to the Internet. |
| sessions of communication(connection), gives | | | | |
| a number(line) of additional opportunities. | | | | Second, in report Skype enciphering is |
| Into problems(tasks) of report SIP enters | | | | without fail applied. It is the compelled |
| only to establish and coordinate | | | | measure caused by p2p-structure of network |
| communication(connection), and it is not | | | | Skype: the traffic passes through units to |
| necessary that this communication(connection) | | | | which should not trust. |
| was voice is there can be any stream of the | | | | |
| data in real time - video, the multimedia | | | | Thirdly, Skype has the high resourcefulness |
| data, interactive service. | | | | allowing it(him) to work even on limited |
| | | | connections to the Internet. Skype it is |
| Commands(teams) of the report remind HTTP, | | | | focused on the broad audience of users of the |
| down to separate details. | | | | different countries and interventions in work |
| | | | of a network with the purpose to forbid VoIP |
| Key feature SIP is client - server opiented. | | | | for him(it) are less terrible, because it(he) |
| Here it is meant, that at any network of a | | | | is prepared for this. It is known, that |
| SIP-telephony there is a server (GateKeeper). | | | | report Skype has ability to find ways to |
| | | | transfer the voice information. For example, |
| Report SIP is well focused for work in local | | | | if the necessary range of ports of report UDP |
| networks and on good Internet - channels. But | | | | is closed (usually report Skype uses port UDP |
| what will take place when the Internet - | | | | 40150), Skype is switched to use of free |
| пров& | | | | TCP-ports, down to obviously open 80 ports |
| amp;#1072;йде&a | | | | (HTTP), and if it is necessary, will use |
| mp;#1088; on what or the reasons does not | | | | connection through HTTP-proxy. It means, that |
| wish, that users could carry out bells | | | | Skype will work practically everywhere where |
| through SIP? For achievement of the purpose | | | | Internet - sites "open". |
| to it "will cut" enough UDP packages with | | | | |
| value of port 5060 that SIP has ceased to | | | | There are bases to consider, that Skype uses |
| work normally. There are ways to avoid a | | | | the modified version of the standard |
| similar arbitrariness, however it | | | | SIP-report. In other words, SIP was taken for |
| intervention in work of the report demand, | | | | a basis of report Skype and it is modified, |
| forcing to forget about compatibility with | | | | due to what Skype has competitive before |
| the standard equipment. | | | | operators of a SIP-telephony - cheapness |
| | | | support a user's network and ability to work |
| The report used Skype always was and | | | | almost everywhere and in any conditions. |
| continues to remain closed from foreign | | | | |