SIP demystified

SIP demystified

VoIP or Voice over IP is an expanding industry and has been for the last 10 years. Regardless of the abundant features, organizations have been slowly implementing this technology. SIP (Session Initiation Protocol) is a part of the voip structure. Although it is not the only IP communication protocol used, it is certainly a very prominent one. H.323 is also a well known protocol with similar functions.

SIP is an application layer protocol used for what is called a call setup. It allows two telephones to enter in communication together. There are two phases in a voice call: The call setup and the “exchange of data”. Once the first phase of a call is made, the second phase uses different protocols to actually move the data packets between the two phones.

The most interesting benefit from SIP is certainly the significant reduction of communication costs. All calls (voice or video) between SIP users are free worldwide by using the Internet to establish the communication link between phones, as long as you possess the right applications to communicate. It plays an important part of IP Telephony and allows you to benefit all of the advantages of VoIP (voice over IP).

In order to use SIP, your service provider must support the protocol. Luckily, many providers do (as long as they provide SIP addresses to use and the proper client applications for your computer, tablet or mobile phone compatible with their services). You can validate the availability of the service by going to the provider’s website. They will surely advertise it if they offer the service.

For organizations, The SIP protocol can be used to set up video and audio conferences and allow free communications with representatives travelling worldwide. In a later article, I will elaborate on the mobile SIP client.

Summary
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SIP demystified
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Description
Definition of the SIP protocol and how it works in simple terms.

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