By Barrie Dempster, David Gomillion, David Merel

ISBN-10: 1847198627

ISBN-13: 9781847198624

The e-book bargains readers either a close description in addition to step-by-step directions on deploying software program options in addition to Asterisk configurations. Screenshots are supplied in sections to offer a visible standpoint of the directions. For Asterisk configurations genuine pattern code is indexed within the ebook which might be at once inserted into your Asterisk answer. This e-book is geared toward a person who's attracted to development a robust telephony approach utilizing the unfastened and open resource program, Asterisk, with out spending many hundreds of thousands of greenbacks procuring a advertisement and sometimes much less versatile procedure. This ebook is appropriate for the amateur and people new to Asterisk and telephony. Telephony or Linux event may be invaluable, yet no longer required

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ROI is basically the TCO subtracted from the quantification of the benefit (in money) to the business. Therefore, if we calculated that a new phone system would save $5000 and cost $4000, the ROI would be $1000. Another interesting calculation to make, which is also categorized as ROI, is the time for the cost to be recouped. This calculation is the one that I find helpful in making a business case for Asterisk. Suppose a phone system costs $5000 to install. Using toll bypass, you can save a net $500 per month.

The Public Switched Telephony Network (PSTN) Most of the telephones in the world are connected to a vast network, enabling any telephone to reach any other. This network is called the Public Switched Telephony Network (PSTN). The phones that are on this network are reachable by dialing a number, which may include country codes, area codes, and telephone numbers. While there are instances in which interconnection with the PSTN is inappropriate, most users of telephones have the expectation that they can reach the world at large.

By using high-quality components, we increase the likelihood of ending up with a high-availability phone system. On another note, we should select a server with as much redundancy as possible. A RAID-1 controller could save our phone system in the event of a hard drive failure. A pair of RAID-1 controllers that are mirrored could save our phone system in the event of a controller failure or a PCI slot failure. A server with redundant power supplies will help us in the event of power failure or a power supply failure.

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Asterisk 1.6 by Barrie Dempster, David Gomillion, David Merel

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