Softswitch: Architecture for VoIP by Frank Ohrtman

By Frank Ohrtman

Bypassing the outdated circuit-switched undefined, softswitches streamline message site visitors and supply a way more effective provider improvement surroundings. in addition to SIP, this expertise leverages net applied sciences to switch plain-old-telephone carrier. builders who're freed up by means of softswitch know-how to construct good value 3G serives will learn the way it really works and what purposes it may aid. community managers making not easy judgements approximately even if to set up VoIP will examine execs and cons, expenses and advantages, and most significantly find out how to separate fantasy from truth.

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The business need not train its staff to use new hardware or software to work their existing telephone handsets. This option also offers investment protection in that the business retains its expensive PBX and PBX-associated telephone handsets. The only thing that has changed is that the company reduces or eliminates interoffice phone bills. Enterprise gateways are usually configured in multiples of T1 or E1 cards in a single chassis that interface with the trunk side of the PBX. The T1 trunks connect to the line side of the gateway.

A zone is a collection of one or more gateways managed by a single gatekeeper. A gatekeeper should be thought of as a logical function and not a physical entity. The functions of a gatekeeper are address translation (a name or email address for a terminal or gateway and a transport address) and admissions control (authorizing access to the network). As VoIP networks got larger and more complex, management solutions with far greater intelligence became necessary. Greater call-processing power became necessary, as did the capability to interface signaling between IP networks with the PSTN (VoIP signaling protocols to SS7).

Com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. 25 minutes per year fails, its replicated unit takes over. Redundancy is usually expressed in terms of a ratio of 1:1 where one replicated unit exists for every primary unit or N11 redundancy where there are N(NϾ1) replicated units per primary unit. Another mechanism to enhance reliability is to ensure no single point of failure (SPOF) exists on the system. That is, every mechanism has a backup in the event of the failure of one unit.

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