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Introduction to Sip IP Telephony Systems: Technology Basics, Services, Economics, and Installation
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This book explains why people and companies are using SIP equipment and software to efficiently upgrade existing telephone systems, develop their own advanced communications services, and to more easily integrate telephone network with company information systems.
This book provides descriptions of the function parts of SIP systems along with the fundamentals of how SIP systems operate. It identifies and explains what key services are possible through the use of SIP and how existing phone s...