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Integrated Services Digital Network (ISDN) 
An international standard for switched, digital dial-up telephone service for voice and data

Internet Protocol (IP)

A network that uses the IP protocol, which is part of the TCP/IP protocol suite.The Internet Protocol (IP) is the method or protocol by which data is sent from one computer to another on the internet


Return On Investment (ROI)

A performance measure used to evaluate the efficiency of an investment. That is, the benefit (return) of an investment is divided by the cost of the investment


Total Cost of Ownership (TCO) 

In general, the purchase price of an asset plus the additional costs of operation. This includes indirect costs of installation, training, repairs, downtime, technical support, and upgrading


Turnkey solution

A turnkey solution is one that is immediately ready to use upon implementation and can be easily applied to current business processes


End-to-End Solution (E2ES)

This implies that the supplier of an application system will provide all the hardware and/or software components and resources to meet the customer's individual requirements


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