Skype vs SIP

Skype vs SIP

by Andrey Poshataev

SIP - the open standard, and Skype - closed. But Skype adapts for real conditions better, SIP it is focused on conditions relatives to ideal.

Report SIP, Session Interaction Protocol (RFC 3621) is open by a cavity for developers. It(he) is well enough thought over, and at the present moment is the most popular as it is simple enough for hardware realization and, besides the organization of voice sessions of communication(connection), gives a number(line) of additional opportunities. Into problems(tasks) of report SIP enters only to establish and coordinate communication(connection), and it is not necessary that this communication(connection) was voice is there can be any stream of the data in real time - video, the multimedia data, interactive service.

Commands(teams) of the report remind HTTP, down to separate details.

Key feature SIP is client - server opiented. Here it is meant, that at any network of a SIP-telephony there is a server (GateKeeper).

Report SIP is well focused for work in local networks and on good Internet - channels. But what will take place when the Internet - провайдер on what or the reasons does not wish, that users could carry out bells through SIP? For achievement of the purpose to it "will cut" enough UDP packages with value of port 5060 that SIP has ceased to work normally. There are ways to avoid a similar arbitrariness, however it intervention in work of the report demand, forcing to forget about compatibility with the standard equipment.

The report used Skype always was and continues to remain closed from foreign developers. It has number of features which distinguish it from SIP.

First, report Skype is focused on a p2p-network (Peer-To-Peer.) Skype works by a principle self-organizing distributed(allocated) p2p networks in which there are no constant servers. The role of servers is carried out by the participants of a network having direct IP-address and the wide channel of connection to the Internet.

Second, in report Skype enciphering is without fail applied. It is the compelled measure caused by p2p-structure of network Skype: the traffic passes through units to which should not trust.

Thirdly, Skype has the high resourcefulness allowing it(him) to work even on limited connections to the Internet. Skype it is focused on the broad audience of users of the different countries and interventions in work of a network with the purpose to forbid VoIP for him(it) are less terrible, because it(he) is prepared for this. It is known, that report Skype has ability to find ways to transfer the voice information. For example, if the necessary range of ports of report UDP is closed (usually report Skype uses port UDP 40150), Skype is switched to use of free TCP-ports, down to obviously open 80 ports (HTTP), and if it is necessary, will use connection through HTTP-proxy. It means, that Skype will work practically everywhere where Internet - sites "open".

There are bases to consider, that Skype uses the modified version of the standard SIP-report. In other words, SIP was taken for a basis of report Skype and it is modified, due to what Skype has competitive before operators of a SIP-telephony - cheapness support a user's network and ability to work almost everywhere and in any conditions.

Why VoIP Is Becoming So Popular

Why VoIP Is Becoming So Popular

by Dennis Jaylon

Voice Over Internet Protocol is one of the latest discovery in the field of communication. The simple function upon which it sells itself is the factor that it uses the Internet to make calls. Endowed with several advantages, VoIP is believed to be one of the best and the most economical ways to make calls to international locations today. Moreover, quite easy to set up and use, the service can be availed easily too.

As said earlier, VoIP lets you make calls through the Internet, wherein you are charged for the Internet facilities you are using during the call process. In this condition, you have to pay only the local call charges and the usual Internet expenses. Thus, it makes no difference whether you are calling an international location or domestic one since the charges will remain the same. Thus, for companies operating in different countries, and for people who make a lot of international calls, VoIP is the best solution to cut down on telephone bills and save plenty of money.

Further advancements have deployed Internet telephony to be availed free of cost. All you need is a headset, sound card, a computer and an Internet connection. The next thing you need to do is to download any of the many VoIP software packages like Skype, Net2Phone, Gizmo and Free World Dialup. After you have installed any of these softwares, ask all your friends or people you want to chat with to install the same software. After the software has been loaded on both sides, you are free to make calls.

Not only is this service seamless, but quite economical too. Using VoIP solution assures you better voice quality than what you get on traditional calling. Moreover, VoIP enabled phones are equipped with several features like call forwarding, voice mail box, redial button and call records, which make the communication easier. Portability is another important feature attached with it. Even when you are travelling, you can make calls through Internet telephony.