SIP 101 - Session Initiation Protocol Explained

Session Initiation Protocol or SIP refers specifically to a language that various computers can communicate to one another in so that they can complete voice calls. It has become vitally important in recent years as it plays a central role in VoIP or Voice Over Internet Protocol. VoIP Is the rapidly growing technology which has millions of Americans throwing out their local and long-distance telephone bills and replacing them with free calls made over the internet. While Session Initiation Protocol sounds like technobabble, it helps if you can imagine SIP as the common language that new generation operators use to complete calls over the internet. With SIP, however, the operators are no longer hundreds of people in a room somewhere connecting one call to another but simply your computer device connecting to the telephone or computer device of the person you want to talk to. The fact that there is no need for real operators, or even a central board to complete calls through, explains part of why SIP is so revolutionary. SIP was intended to give ordinary callers like you and me all the familiar functions and features of what we expect from a phone call, such as a dial tone, a ringing sound, etc. So while all the communication from our end seemed exactly the same as before, SIP makes phone calls by communicating directly with the other person