About VOIP PBX System
Voice over Internet Protocol (VoIP) is a rapidly emerging technology for voice communication that uses the ubiquity of IP-based networks to deploy VoIP-enabled devices in enterprise and home environments. VoIP-enabled devices—such as desktop and mobile IP phones and VoIP gateways—decrease the cost of voice and data communication, enhance existing features, and add compelling new communication features and data services

The overall United States telecommunications industry, including equipment and services, generated more than $600 billion in revenue in 2000. Although VoIP is currently a small fraction of this revenue, it is growing quickly. In North America, wholesale VoIP sales were estimated to approach well over $400 million in 2002. Total equipment purchases of VoIP gateways, soft switches such as IP Private Branch Exchange (IP PBX), and VoIP application servers are expected to reach almost $12 billion by 2006, a six-fold increase over 2001. Similarly, the revenue from selling wired enterprise IP phones may exceed $2.7 billion by 2006; this figure does not include mobile IP phones or phones used in private homes.

Knowledge workers and consumers alike benefit from the improvements that VoIP makes possible.

Compelling New Services That Enhance User Productivity
The extensibility and flexibility of VoIP enables manufacturers, software providers, and service providers to offer and more effectively expose a broad variety of features and services that directly add value for users. The integration of voice, data, and video with IP networks and devices has made the interaction and exchange of these types of communication easier, enhancing user productivity. 

VOIP Simple Architecture     VOIP Detailed Architecture

FACTS / White Papers
VoIP technology enables the integration of data traffic and voice communication traffic into a single network, reducing the total cost of ownership (TCO) associated with a combined voice/data network. Using VoIP, analog voice signals are digitized and converted into data packets that are sent over IP-based networks. The integration of multiple media types—voice, data, and video—into a single network eliminates infrastructure and maintenance redundancies, helping to reduce capital costs and operational costs. Remote management reduces costs, including expenditures that are associated with user Moves, Adds, and Changes (MACs) and costs that are related to updating edge devices with the latest customer applications and services.

VoIP systems increasingly demonstrate greater cost-effectiveness than traditional voice networks. As VoIP technology evolves, the cost/benefit ratio, alongside efficiency and flexibility in implementation, will continue to increase.
The following chart compares the cost of two deployment scenarios for an enterprise of 10,000 phone users, where 50 percent of employees are divided between two large locations and the remainder among 12 branch offices. Analysis shows that replacing the current PBX with another PBX increases the cost by approximately 48 percent. However, replacing the existing PBX with an IP PBX saves approximately 11 percent of the overall replacement cost.
 

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