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Implementing Cisco Voice Gateways and Gatekeepers (GWGK) v © Cisco xawb.info Cisco Voice Gateways and Gatekeepers Understanding and configuring GW/GK in complex VoIP networks Denise Donohue, CCIE® No. Editorial Reviews. From the Back Cover. Cisco Voice Gateways and Gatekeepers . Understanding and configuring GW/GK in complex VoIP networks. Denise.
IP communications titles from Cisco Press help networking professionals understand voice and IP telephony technologies, plan and design converged networks, and implement network solutions for increased productivity. Session Initiation Protocol. Download - 1. Download - KB -- Index. Errata -- 28 KB.
Cisco Voice Gateways and Gatekeepers (Kobo eBook)
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Part of the Networking Technology series. Voice signaling requires the capability to provide supervisory, address, and alerting functionality between nodes. SS7 uses out-of-band signaling, which, in this case, is the exchange of call control information in a separate dedicated channel.
VoIP presents several options for signaling, including H. SIP and H.
For example, when an MGCP gateway detects a telephone that has gone off hook, it does not know to automatically provide a dial tone. The gateway sends an event notification to the call agent, telling the agent that an off-hook condition has been detected.
The call agent notifies the gateway to provide a dial tone. Database services include access to billing information, caller name delivery CNAM , toll-free database services, and calling-card services. VoIP service providers can differentiate their services by providing access to many unique database services.
For example, to simplify fax access to mobile users, a provider can build a service that converts fax to e-mail. Another example is providing a call notification service that places outbound calls with prerecorded messages at specific times to notify users of such events as school closures, wake-up calls, or appointments. Proper supervision of these channels requires that appropriate call connect and call disconnect signaling be passed between end devices.
Correct signaling ensures that the channel is allocated to the current voice call and that a channel is properly deallocated when either side terminates the call. Connect and disconnect message are carried by SIP, H. Each codec type defines the method of voice coding and the compression mechanism that is used to convert the voice stream.
Each voice channel reserves 64 kbps of bandwidth and uses the G. In VoIP design, codecs might compress voice beyond the kbps voice stream to allow more efficient use of network resources. The most widely used codec in the WAN environment is G. It also defines end-to-end call signaling. MGCP provides the signaling capability for less-expensive edge devices, such as gateways, that might not have implemented a full voice-signaling protocol such as H.
For example, anytime an event, such as off-hook, occurs on a voice port of a gateway, the voice port reports that event to the call agent. The call agent then signals the voice port to provide a service, such as dial-tone signaling.
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SIP defines end-to-end call signaling between devices. SIP is a text-based protocol that borrows many elements of HTTP, using the same transaction request and response model and similar header and response codes.
The end stations telephones that use SCCP are called Skinny clients, which consume less processing overhead. The H.
It was developed as a protocol that provides IP networks with traditional telephony functionality. Today, H. The protocols specified by H. This is achieved by exchanging H. The call-signaling channel is opened between two H. August 17, Language: English ASIN: Enabled X-Ray: Not Enabled. Share your thoughts with other customers.
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Write a customer review. Top Reviews Most recent Top Reviews. There was a problem filtering reviews right now. Please try again later. Kindle Edition Verified download. Now with that out of the way this is a good book for Mid to senior level engineers who are aware of the changes. Gatekeepers have taken a back seat due to SIP being the primary driver in deployments, but there are still plenty of them out here and you may run into 1 or a reason to have one.
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Excellent Business. An excellent book! Thank you, the authors, who took readers into consideration when writing this book!
This book is a great practical guide to help people both understand Cisco gateways and gatekeepers and configure them properly.
This book describes the Cisco voice gateway and gatekeeper theories and protocols in a way that readers can apply to their own networks. It provides examples, screen shots, configuration snips, and case studies in abundance.
The book also includes the typical tasks and issues in deploying voice gateways and gatekeepers, in addition to advanced features and capabilities.
Cisco Voice Gateways and Gatekeepers
Emphasis is placed on the accepted best practices and common issues encountered. It is not written specifically as a preparation for the Cisco Gateway Gatekeeper exam, but the topics that are covered on the exam are included in this book. The target audience for this book includes network engineers, IP Telephony engineers, and Telco engineers who are tasked with the installation, configuration, and maintenance of VoIP and IP Telephony networks.
I describe this book further in the context of its table of contents. Part I, "Voice Gateways and Gatekeepers" Chapter 1, "Gateways and Gatekeepers"-- This chapter provides an overview of components of an IP voice network, including different types of gateways, such as routers, standalone devices, and switch modules, H. It also describes different types of call agents that are used in IP voice networks. In addition, it introduces the network used throughout the book in examples and case studies.
Chapter 3, "H. It then covers implementing H.
Chapter 4, "Session Initiation Protocol"-- This chapter describes how SIP implements call signaling, describes the various SIP functions and how they participate in the call flow, and lists the pros and cons of the protocol and when to use it. It looks at the different signaling types, features, and uses of each type of circuit; issues such as echo cancellation; and selection and sizing of the circuit.
The chapter also discusses caller ID and name delivery considerations. Handling faxes and modems in a VoIP network are discussed.
Chapter 9, "Dial Plans"-- This chapter covers dial plan design and implementation. It discusses building a scalable dial plan, handling overlapping number ranges, and implementing a dial plan on gateways and call agents. It helps you understand the different types of dial peers and how they affect call routing by examining the way that the gateway selects dial peer matches. Chapter 10, "Digit Manipulation"-- This chapter discusses various ways for a gateway to control called and calling phone numbers, including digit stripping, forwarding only a specified number of digits, prefixing digits, and expanding numbers.
It also covers voice translation rules, use of regular expressions, voice translation profiles, control of the calling-line identification information, and verification and troubleshooting of digit manipulation.
Chapter 11, "Influencing Path Selection"-- This chapter covers several different ways of influencing route selection, including hunt groups, trunk groups, and tail end hop-off. It describes MGCP fallback and how to configure it. Chapter 14, "DSP Resources"-- This chapter examines codec considerations and configuration, digital signal processor DSP considerations, determination of DSP resources needed, the DSP modes, and configuration of conferencing and transcoding resources on both the gateway and CallManager.
It gives examples, tells how to download Tcl scripts, and shows how to configure gateways to use them. This chapter also examines the auto attendant AA script and creation of audio files in more detail and discusses some caveats and restrictions. It describes gatekeeper functionality in networks with and without a CallManager, gatekeeper CAC and address resolution, redundancy and load balancing, gatekeeper security, and use of hierarchical gatekeepers.
A discussion of planning a gatekeeper implementation includes placement, bandwidth, and dial plan issues.VoIP shares bandwidth across multiple logical connections, which results in a more efficient use of the bandwidth, thereby reducing bandwidth requirements. Part I provides an overview of an IP voice network. Note Because H. Access to this information allows quick problem solving, which builds strong customer relationships. Kevin Dooley. Concurrent Programming: The Art of Network Architecture.
Michael Valentine. Aaron Newman.
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