For SIP in VoIP to effectively take place, the need for a broadband internet connection is a must. Once done, SIP enabled instruments, tools or devices are able to communicate with one another.

Functioning of SIP in VoIP

SIP in VoIP works this way. In telephones it will first compress speech to data packets, than transfer the packets through the internet, decode the packets back towards speech, so that the listener at the other end is able to hear. What we as common person do not realize is that once we speak over a telephone or mobile phone using VoIP, there are plenty of processes that takes place before the listener receives at the other end.

The SIP transforms the above process in a matter of milliseconds.

Many users get confused between VoIP and SIP. SIP in short can be considered as a reformation taking place between the caller and the receiver, that too in a matter of milliseconds. Some of the features where SIP in VoIP functions are the following:

• Call Holding
• Call Conference
• Call Transfer
• Call Forward
• Caller ID
• Auto Attendants

It is because of SIP  that we are able to speak with one another across the globe using VoIP. The transformation from speech to packets, to decoding these packets and back to speech takes place very fast. Even the listener will not be able to judge this point.

Sometimes, the speech becomes a two way speech. For e.g. the caller speaks and has to wait silent for few seconds before the listener is able to hear and revert back. This happens when SIP in VoIP has some interference in the internet routes. But if there is a broadband connection, the speed and the voice clarity are the best and fast.

SIP in VoIPreduces cost as compared to POTS commonly known as “Plain Old Telephone Service”. The cost is reduced by almost 80% from the POTS charges. This is due to the use of internet services. In short, SIP allows telephone lines to pass through an internet broadband connection. Most companies having internal calling system within the office make use of SIP in VoIP service.

SIP is not an instrument or product in particular. It is a program to covert speech and other streaming videos from one place to another through the use of internet. We as normal customers have to only know whether a particular instrument or software is compatible with SIP.

Now that you have got a basic idea what SIP in VoIP is all about, why not try calling your friends through various Internet Service Providers (ISP) available in the world today. Even Skype, Gtalk, ICQ, Yahoo Messenger all function because of the SIP programme.