By Kevin Wallace
Grasp the fundamentals of VoIP (Voice over IP) implementation with theCisco approved self-study ebook for CVOICE origin learningMaster the fundamentals of VoIP (Voice over IP) implementation, managementand troubleshooting arrange for the CVOICE 642-432 examination as you earnyour CCVP certification study from extra content material that challengesreaders at the more durable features of this applied sciences, and is going beyondthe Cisco curriculum fabrics with real-world implementationexamples the second one variation of Cisco Voice Over IP (CVOICE) providesreaders with the entire severe info had to enforce andsupport facts and voice integration options on the network-accesslevel. furthermore, this publication prepares the reader for the CVOICEcertification examination 642-432, which applies to a number of Cisco IPTelephony expert certifications and the Cisco qualified VoiceProfessional (CCVP) certification. The e-book is predicated at the 5.0curriculum, and has additional insurance on relatively difficult parts ofthat direction, similar to H.323 gateway/gatekeeper and QoS configuration.This publication will serve readers as a precious learn reduction and aninvaluable thought, configuration, and troubleshooting reference.Coverage begins with a evaluation for readers new to voice technologiesand maintains with in-depth details on implementation, conceptsand protocols, name keep an eye on types on hand, roadblock andtroubleshooting techniques, and QoS concerns. The booklet additionally expandsbeyond the curriculum to hide issues reminiscent of WRR, AutoQoS on aCatalyst swap, LFI, utilizing MQC to configure category, marking,LLQ, WRED, policing, and shaping. How does the booklet vary from theprevious variation? It contains up-to-date insurance of voice technologies,IOS model 12.3 updates together with AutoQoS, H.323 improvements, MGCPenhancements, and SIP improvements, and functional editorial elementslike hands-on lab workouts and configuration examples are givengreater emphasis.
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To be competitive, service providers must provide their business customers with more efficient, less expensive alternatives to the PSTN for voice and data services. Figure 1-27. Service Provider Environment [View full size image] Requirements in the service provider arena include: • Carrier class performance Voice gateways must provide service that minimizes latency and controls jitter. This level of performance allows customers to maintain voice quality as they migrate from circuit-switched voice to IP-based services.
However, for full-duplex modem connections, the action of the echo suppressor prevents communication. Therefore, when modems handshake, the answering modem returns a 2025 Hz tone to the calling modem, which serves to disable the echo suppressors along the transmission path. Figure 2-22. Echo Suppression [View full size image] 64 65 Echo suppression has shortcomings in addressing certain echo conflict situations. Echo cancellation, a schematic of which is shown in Figure 2-23, is a more sophisticated method of eliminating echo.
Some form of echo is always present, as illustrated in Figure 2-21. However, echo can become a problem under the following conditions: Figure 2-21. Echo Is Always Present 63 64 • The magnitude or loudness of the echo is high. • The delay time between when you speak and when you hear your voice reflected is significant. • The listener hears the speaker twice. The two components of echo are loudness and delay. Reducing either component reduces overall echo. When a user experiences delay, the conversation can get choppy, and the words of the participants sometimes overlap.