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