Carrier Grade Voice Over IP
In 2002 voice over IP will constitute more than 25% of all long distance voice calls, according to Network World. That’s more than a 30% ramp-up from 2001. The emergence of SIP, MPLS and new quality of service tools is making carrier grade voice over IP a service reality, and a potentially huge margin booster and revenue driver for service providers. The first edition of Carrier Grade Voice over IP played a roll in VoIP growth, in less than year becoming an essential tool for carriers working to provide high quality IP telephony. This new edition vastly updates the SIP chapter, details MPLS, and takes the explanations of the previous edition a step further in a final chapter that shows, step by step, how to design working VoIP networks.
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Chapter 9 Designing a Voice over IP Network
Table of Erlang B
Visual Basic174 Code for Erlang Calculations
Glossary of Acronyms
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application bandwidth BHCA bits call agent call signaling Call-ID called endpoint chunk circuit-switched codec command connection contains context CR-LDP CSeq datagram descriptor destination DiffServ digits enables entity established example F F F format functions gatekeeper given header field IETF indicates interface Internet interworking INVITE IP address IP network IPv4 IPv6 ISUP Kbps label layer Logical Channel m=audio M2PA M2UA M3UA Media Gateway Media Gateway Control media streams MEGACO message body MGCP MPLS MTP3 node optional parameter path payload type port number protocol provides proxy PSTN received request reservation response router RSVP RTCP RTP packets RTP/AVP SCTP sender sent sequence number server session description Setup shown in Figure Signaling Gateway softswitch specified SS7 network switch termination tion token bucket traffic TransactionId voice VoIP