Voice over IP Enabling Telephony and IP Network Convergence

摘要

Voice over IP (VoIP) is a generic name for ser- vices, systems and technology for telephony over an IP network. It is also referred to as Internet telephony and IP (Internet Pro- tocol) telephony. Internet telephone client software attracted at- tention when it first appeared in 1995. Since that, VoIP has rapidly matured into a practical technology, propelled by the popularization and rapid development of the Internet. IP net- work traffic already exceeds telephone network traffic and is ex- pected to further increase several-fold in the next few years.