Cisco Voice Gateways and Gatekeepers
- 9h 42m
- David Mallory, Denise Donohue, Ken Salhoff
- Cisco Press
- 2007
Deployments of voice over IP (VoIP) networks continue at a rapid pace. Voice gateways are an essential part of VoIP networks, handling the many tasks involved in translating between transmission formats and protocols and acting as the interface between an IP telephony network and the PSTN or PBX. Gatekeepers and IP-to-IP gateways help these networks scale. Gatekeepers provide call admission control, call routing, address resolution, and bandwidth management between H.323 endpoints including Cisco IOS voice gateways and Cisco Unified CallManager clusters. IP-to-IP gateways allow VoIP calls to traverse disparate IP networks.
Cisco Voice Gateways and Gatekeepers provides detailed solutions to real-world problems encountered when implementing a VoIP network. This practical guide helps you understand Cisco gateways and gatekeepers and configure them properly. Gateway selection, design issues, feature configuration, and security and high-availability issues are all covered in depth. The abundant examples, screen shots, configuration snips, and case studies make this a truly practical and useful guide for anyone interested in the proper implementation of gateways and gatekeepers in a VoIP network. Emphasis is placed on the accepted best practices and common issues encountered in real-world deployments.
Cisco Voice Gateways and Gatekeepers is divided into four parts. Part I provides an overview of an IP voice network. Part II is dedicated to voice gateways, including discussions of Media Gateway Control Protocol (MGCP); H.323; Session Initiation Protocol (SIP); voice circuit options; connecting to the PSTN, PBX, and IP WAN; dial plans; digit manipulation; route selection; class of restriction; Survivable Remote Site Telephony (SRST) and MGCP fallback; digital signal processor (DSP) resources; and Tool Command Languaue (Tcl) scripts and Voice XML (VXML). Part III addresses voice gatekeepers, including detailed deployment and configuration. Part IV is dedicated to IP-to-IP gateways.
About the Authors
David Mallory, CCIE No. 1933 (Routing and Switching/WAN Switching/Security/Voice), has over 15 years of experience and is a technical education consultant for Cisco System's and is the lead on the new Cisco Implementing Gateways and Gatekeepers (GWGK) course and exam.
Ken Salhoff, CCIE No. 4915 (Routing and Switching/Voice), is a systems engineer for Cisco System's Enterprise Field Sales group with over 18 years experience and has worked with voice technologies since 1992.
Denise Donohue, CCIE No. 9566, is a Sr. Solutions Architect with ePlus Technology. She works out of the US Mid-Atlantic region designing data and VoIP networks for companies. Prior to that, she was a design engineer with AT&T, and a Cisco instructor and course director for Global Knowledge. Her CCIE is in Routing and Switching.
In this Book
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Gateways and Gatekeepers
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Media Gateway Control Protocol
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H.323
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Session Initiation Protocol
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Circuit Options
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Connecting to the PSTN
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Connecting to PBXs
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Connecting to an IP WAN
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Dial Plans
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Digit Manipulation
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Influencing Path Selection
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Configuring Class of Restrictions
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SRST and MGCP Gateway Fallback
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DSP Resources
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Using Tcl Scripts and VoiceXML
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Deploying Gatekeepers
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Gatekeeper Configuration
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Cisco Multiservice IP-to-IP Gateway
