The book describes the main characteristic of the Internet and the IP, including the packet loss and delay jitter, and let the reader understand the digital signal processor (DSP) and the role of the speech coder in VoIP, this book also tells the story of how the readers through the ISDN, xDSL, HFC local loop between the service provider or other way to build a pathway, and the main IP phone protocol, the cover of the book: VoIP comprehensive solution; VoIP gateways and net brake role; No. 7 signaling (SS7) and IP, h. 323 network communication between; VoIP support multicast protocol (IGMP and MBONE), bandwidth reservation protocol (RSVP, RTP and RTCP) and security business,
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