SIP means Session Initiation Protocol. SIP was developed because of the need for real-time session signaling over networks which are packet-based. Each protocol has different priorities, origins, and supporters. It is basically the signaling protocol which is used on an IP network. It takes real-time communications up to a different level. There is so much more to SIP than VoIP protocols. It is based on HTTP and adds reliability, flexibility, and quality to VoIP. There are many, many different software programs that make use of a SIP provider, offering video, voice, and text. Without a SIP service provider, programs such as Skype and iChat would have to find an alternative means of communication. SIP is the standard solution to many of these services.

There are some great advantages of using a SIP telephony provider. Numbering flexibility is one of the most prominent of these. It can support both conventional communications by telephone and IP communication by basically establishing a permanent connection between the two parties for the duration of a call. The SIP phone provider can mitigate some of the problems with traditional circuit switched technology. Some of these problems include the expense of circuit switched networks which are generally passed on to the consumer and, a significant increase in bandwidth which is dedicated to a call. With SIP technology, all voice streams are broken up into different pockets; they are then compressed, and finally sent outwards to their destinations through different routes, which depends on network congestion. At the destination, each packet is decompressed once it has been reassembled and the resulting files are converted back into recognizable voice streams by using hardware and software.

A VoIP SIP provider offers greater efficiency and cost effectiveness than do the traditional circuit switched networks. As the technology for VoIP goes through its evolution, this efficiency and cost effectiveness will continue to increase. Not only is this saving going to affect the end price that the consumer is going to pay, it will also apply to enterprises as these savings are passed on from the SIP gateway provider.

You need an address and a program in order to make use of a SIP provider. These addresses come in the form of e-mail addresses, SIP addresses, or IP addresses. You can then avail of special features such as voicemail. The system is turning out to be fantastic for the consumer because of the cheap cost involved, at many times the service will be made available for free. And, with cost being a real issue with most people these days, this advantage will see SIP technology evolving to even greater heights. The advantages to the consumer include not having to change your number every time you move and having much greater flexibility in the amount of additional numbers that you add to your site. There are many telephones which make use of the VoIP technology; they are the same as a regular phone except that you can make free calls to anyone, anywhere in the world who also have access to technology.