VOIP Voice Over IP

VoIP is the ability to make telephone calls and send faxes over IP-based data networks with a suitable quality of service and superior cost/benefit.

Significant advances in technology have been made over the past few years that enable the transmission of voice traffic over traditional public networks such as Frame Relay (Voice over Frame Relay) as well as Voice over the Internet through the efforts of the Voice over IP Forum and the Internet Engineering Task Force (IETF). Additionally, the support of Asynchronous Transfer Mode (ATM) for different traffic types and the ATM Forum's recent completion of the Voice and Telephony over ATM specification will quicken the availability of industry-standard solutions.

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Justifications for development of VoIP can be summarized as follows:

1. Cost reduction. There can be a real savings in long distance telephone costs which is extremely important to most companies, particularly those with international markets.
2. Simplification. An integrated voice/data network allows more standardization and reduces total equipment needs.
3. Consolidation. The ability to eliminate points of failure, consolidate accounting systems and combine operations is obviously more efficient.
4. Advanced Applications. The long run benefits of VoIP include support for multimedia and multiservice applications, something which today's telephone system can't compete with

Frame Relay, IP and ATM are known as packet or cell switching technologies. This is in contrast to the public telephone network, which is a circuit switching technology, designed to carry voice transmissions. Frame Relay and IP insert data into variable-sized frames or packets. ATM chops data into small cells, which facilitates fast switching of data through the network.