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¡ôImplementations of VOIP and Applications
People have three ways to deploy voice-over ¨CIP(VOIP) services. Each is designed to support a specific network configuration and type of customer.
A gateway sits between a telephone system, such as a PBX or a central office switch, and a data network, such as the Internet, and translates calls from one format to another. Gateway functionality can be packaged in a number of different ways: dedicated devices, add-on cards for voice products and software for local-area network servers.
Because there is such a large installed base of voice equipment, many vendors have focused on this approach first. Established companies such as Cisco Systems Inc., Lucent Technologies, Nortel Networks Inc. and Vocal Tec Communications Ltd., offer those products. Although the devices can be used within enterprises or on carrier networks, the initial emphasis has been on the carrier segment
 Internet Protocol Private Branch Exchange
An IP, or software, PBX is a specialized computer system that replaces a company¡¯s traditional voice system. The devices-which usually are installed when a company makes a dramatic change, such as moving into a new building- support IP voice transmissions all the way down to a user¡¯s desktop. Companies such as AltGen Communications Inc. and Artisoft Inc. have been in the market for about five years. Cisco and 3Com Corp. gained entry by acquiring small start-up firms during the past year. Recently established PBX vendors such as Lucent and Nortel have been adding this functionality to their systems.
The devices have been geared to small-and medium-size enterprises. Scalability has been an issue with these products; their top capability has been a few hundred users. Recently, vendors have begun to deliver systems that can support tens of thousands of users.
Integrated Voice and Data Systems
Integrated voice and data systems treat VOIP as just another application on a corporate LAN. These systems often have a number of functions, such as messaging, in a device geared to handle a company¡¯s data and voice needs.
Praxom Inc. and Vertical Networks Inc. are two of the leading suppliers in this space. These systems can be used in small organizations (a few hundred employees) and a large company¡¯s branch offices.
Applications abound
There are many VOIP that are possible when voice traffic is handle be a standard data network:
¡¤Unified messaging funnels e-mail, fax and voice-mail messages into a mailbox that can be accessed be a PC.
¡¤Fax over IP enables an organization to send faxes via PCs rather than rely on separate machines
¡¤Voice response systems reply to users or customers via a computer¡¯s spoken words rather than with text messages.
¡¤¡°Click to dial¡± enables a person to cohort or a friend be clicking on a mouse.
¡¤¡°Click to talk¡± moves a user from accessing data at a Web site via a browser to talking with a customer service representative.
¡¤Automated call distributors are used in call centers to parcel incoming call among customer service representatives.
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