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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’s telephone device. Unlike traditional telephony, which was based on a cog and wheel approach in which the call you placed goes through a central location and then is routed to the person you are trying to call, SIP is based on internet protocol. This means that there is no need for a central cog to run calls through, but rather calls can be made directly from person to person.

The fact that the technology is based on internet protocol (IP) rather than a traditional cog and wheel also means that placing and receiving calls are no longer inhibited by location. To conceive of this more easily it is best to think of something like your e-mail. You can take your laptop and access your e-mail from your home, just as easily as you can plug that laptop into the internet at access your e-mail from anywhere. In the same way, you can plug your SIP phone into any access point in the internet and call a person who can be located anywhere in the world. Similarly you can receive phone calls from anywhere in the world no matter where you are, simply be plugging your SIP phone into the internet.

As you can probably imagine, this ability has some pretty remarkable applications. For companies or businessmen that work out of the office, moving your office phone number is as simple as picking up the phone and carrying it with you. There is nothing else to it. For those often staying in hotels for travel or business, this means always having the direct office line with you wherever and whenever you want. No need to forward calls or even to ever pay for long distance or hotel phone access again!

The SIP technology is already revolutionizing the way in which humans communicate. In recent years, literally millions of Americans have tossed aside their traditional land based phone lines and opted for the freedom and cheapness of VoIP. Empowered with SIP technology it is uniquely able to provide you with virtually free calling, anywhere in the world, anytime in the world, without having to forward calls, change your number, or rely on others to check important messages. It is truly a technology for the future of business as well as the future of communication.

Jim Sherman writes about interesting topics such as SIP4PBX.

SMS 101 - Short Message Service Explained

Short Message Service (SMS) is a quick and simple way to communicate short messages via mobile phones, handheld devices, and increasingly even landline telephones. Commonly known as text messages, SMSes, or even texts the practice has spread rapidly throughout the world, evident by the fact that 500 billion such messages were sent in the last year alone. The practice has its popularity due in great part to its convenience and cost effectiveness. For example, a typical text message placed in the US at USD 0.05 per message is priced at just 10 to 20% that of a voice call. Such savings have made it the most popular form of communication in many countries, and the practice is quickly gaining in popularity in the United States as well.

This quick rise in American’s usage of SMS is due in part to the publicity the practice received through television shows like The American Idol, where viewers ‘texted’ their votes in for their favorite singer. This initial exposure gave many Americans their first taste of the convenience and ease of use with SMS.

Texting involves using the keypad on a telephone or other device to spell out letters and then words. Then when a message is completed the writer sends the message, much like an instant message or e-mail to the recipient. While some devices now have actual qwerty keyboards the vast majority of SMS capable devices and telephones simply use the 12 key numerical keypad (0-9 plus * and #). By pressing a certain key in quick succession different letters are made. For example, pressing the ‘1’ key once produces the letter ‘a’. Pressing it twice gives the letter ‘b’, while three times gives ‘c’. The other numbers (2-9) work the same way while the other keys (*, 0, and #) are usually reserved for creating spaces and punctuation. While texting does require a bit of initial practice, within a few minutes users are able to quickly spell out and send short messages.

Most SMS services such as those transmitted to a telephone, have a limit as to how many characters can be transmitted per message. This number can vary from service to service, however many allow for 140 or 160 characters. This limitation has caused users to develop what has become known as Txt Speak. These are a set of commonly used abbreviations and word substitutes that not only reduce the number of characters necessary for conveying a word or message, but also make SMSing or Text Messaging an even faster and more convenient process. For example, the number ‘4’ is commonly used to replace the word ‘for’, and ‘gr8’ replaces the word ‘great’. Some individuals also choose to omit spaces between words by using capital letters instead, such as ‘TextingIsFun’ instead of ‘Texting is fun’. A relatively new phenomenon that many texting devices are now incorporating is Predictive text software. This gives your phone the technology to anticipate what word you are going to write even before you finish writing, drastically reducing the time it takes for you to text messages. For example, you may type the letters ‘ste’ and the software, which is built into the device, will have predicted the word ‘stereo’ for you.

SMS is a technology whose convenience and cost effectiveness have already made it an integral part of communication in many countries. In recent years, it has been more widely publicized in the United States and as a consequence its popularity is increasing quickly. This growth is not surprising, however, due to the many benefits that Short Message Service (SMS) brings to communication.

Jim Sherman writes about interesting topics such as SMS Call.

How to Never Pay a Hotel Phone Bill Again

Session Initiation Protocol (SIP) is a signaling protocol for establishing sessions in an IP network. But if you are like most of us, that means nothing to you. In layman's terms, SIP is a method by which various computers can talk to one another so that they can complete voice calls. The protocol is increasingly being adopted as the standard means by which computers communicate to facilitate VoIP or Voice Over Internet Protocol. So you can imagine SIP as a common language for new generation operators to speak to connect calls. However, there are no operators there is only your computer (or other hardware) and that of the person you are speaking with. That brings this introduction to some of the many benefits of SIP communication.

The goal of SIP was to provide users with many of the functions and features they typically expect with making phone calls, such as familiar rings, hearing the ring back tone when a call is placed, and the process of dialing a number. SIP goes beyond this however, also implementing a number of advanced features. Despite its’ convenient interface that mirrors that of a typical telephone call, SIP is based on an internet protocol rather than that of the telephone industry. Because of this, SIP is able to work seamlessly alongside other internet based protocols. This has allowed the technology to uniquely establish a user location, meaning that you can tell the IP address or "location" from which a person is making a call, something vital for offering emergency services. It also allows for coordination amongst the various participants in deciding upon what call features will be supported, as well as providing the protocol for call management which allows for adding, dropping, or transferring call participants.

One of the most exceptional benefits of Session Initiation Protocol (SIP) is its application with Private Branch Exchange (PBX). A private branch exchange is a private telephone network used within an enterprise in which users share a certain number of outside lines for external telephone calls. This provides a significant cost savings to the company because it allows companies to quickly and easily make calls within their institution, as well as save by limiting the number of external phone lines that must be maintained. SIP can extend these cost savings dramatically by offering users free long distance calls worldwide. Once again, because SIP is internet based rather than running over traditional telephone lines, the cost of call transmission are as cheap as say sending an e-mail, that is to say, Free! While PBX is already an efficient use of office resources incorporating SIP into a PBX means taking such savings and capabilities to a new level. Incorporating SIP gives users’ access to free interoffice communications, long distance calls, as well as huge savings in setup and transaction costs. These transaction cost savings are due to the fact that SIP is based on internet protocol allowing for the ability to physically move phones without any need for rewiring or new setup costs. Because that the system is peer-to-peer rather than cog and wheel like hardwired telephony means that there is no complicated setup necessary, but rather users can simply plug the phone into any available broadband connection and without the need for any complicated hardware or software, calls are ready to be made and received.

This brings us to what is potentially the greatest savings that SIP provides. We all hate to have to pay $2.00 for making a simple local call from a hotel room. But for those of us that have had to pay exorbitant long-distance charges from hotels, the level of angst felt reaches new heights. Add to this the fact that often companies require conference calling for their employees, a service that hotels are all too happy to charge a high premium to provide. For companies that have a lot of their employees traveling or practicing in various locales, the overhead costs of making such calls can really put a damper on year end profits. SIP offers a solution to hotel bills, and for that matter all telephone bills whatsoever. Just as sending an e-mail is free whether you are sending that e-mail to a person across the street or around the world, so making a call using SIP from any locale to any other locale in the world is free. All that is needed is a broadband connection. And just as one can send an email from wherever the internet can be accessed, SIP users can make their free calls from the office, the home, or even (gasp) the hotel room. Not to mention the huge savings in regular long-distance charges, the simple fact that long distance and local calls can be made for free from hotel rooms (most of which offer complimentary broadband service) is an enormous long-term cost savings. But add to this the fact that conference calls are available at no additional cost, which can be explained by following the principle that sending an e-mail to many individuals at the same time is just as cheap as one to one communication. Altogether these savings mean that companies who have in the past been laden with high local and long distance phone bills will be able to have their employees keep in close communication no matter their location for free.

SIP goes beyond this, however. Because SIP uses peer-to peer connections there are no extra costs for having hundreds or even thousands of employees making SIP calls whereas the management costs for such a system under traditional telephony would be astronomical. This is never the case with PBXs that utilize SIP in a peer to peer connection format, however, where structural costs do not increase as your business grows and your usage of the PBX increases.

Session Initiation Protocol (SIP) offers customers of traditional telephony fantastic cost savings, the flexibility to make free calls from anywhere in the world at any time, and the ability to expand a PBX system with no setup costs. Because there is no complicated hardware or software necessary to setup SIP in a PBX, implementing the technology is as simple as having access via broadband to the internet. Due to these benefits as well as innumerable others, expanded use of SIP in PBX and in a variety of other settings is simply a matter of expanded customer exposure to the possibilities of SIP.

Jim Sherman writes about interesting topics such as Mobalex technology.