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Expand your IP PBX Systems

Updated on May 10, 2011

Local IP PBX Systems

Businesses are usually the first to adopt new technologies when they hold the promise of saving cash. Unlike home owners who sometimes prefer familiarity instead of efficiency, private firms are charged with the business of generating as much profit as possible - and to do this, they always jump at anything which promises a reduction in operating expenses. So it's hardly surprising that long before VoIP came into vogue for regular users, businesses were already making use of IP technology to save costs.

Many businesses have a local IP PBX system which allows them to save on internal company calls. Even if two offices are separated by a long distance, they can talk to each other over the Internet as long as they both have the same communications software installed. It's a bit like having your own mail server and using it to send email to each other. This is why an ITSP can connect any two of its customers for free.

However, such a PBX system has the potential to do a lot more and surprisingly, many firms still haven't taken the next step of opening up their PBX systems to the world at large. In this article, we see how to do this and what the benefits are.

VoIP IP PBX
VoIP IP PBX

Converting an IP PBX to VoIP

It's possible to leverage the power of this IP PBX system to extend it and use it to communicate with the world at large - and not just with internal employees. To do this, it has to be able to talk to the PSTN phone system to which the majority of people are connected. This can be achieved using what we call an SIP trunk. This SIP trunk is provided by the ITSP who has tie ups with the telecom companies to carry your traffic to all the phones in the world. Using such functionality, you can make international calls at extremely cheap rates and take advantage of all the other benefits such as VoIP HD voice offerings.

The day will come when you will be easily able to communicate with other VoIP enabled systems without going through the common PSTN system. Thanks to the SIP protocol which most business VoIP PBX services are standardizing upon and the "ENUM" functionality which is being developed, we'll soon be able to tell whether or not a particular telephone number is linked to a VoIP account or not and if so, what that account's SIP URI is. Once we know that, VoIP systems can talk to each other entirely over the Internet for free - and that is the day we all hope to see soon.

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