By Kevin Wallace
Grasp the fundamentals of VoIP (Voice over IP) implementation with theCisco licensed self-study ebook for CVOICE beginning 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 points of this applied sciences, and is going beyondthe Cisco curriculum fabrics with real-world implementationexamples the second one version of Cisco Voice Over IP (CVOICE) providesreaders with the entire serious details had to enforce andsupport info and voice integration ideas on the network-accesslevel. moreover, 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 booklet is predicated at the 5.0curriculum, and has additional assurance on fairly difficult components ofthat direction, reminiscent of H.323 gateway/gatekeeper and QoS configuration.This e-book will serve readers as a important research relief and aninvaluable conception, configuration, and troubleshooting reference.Coverage begins with a evaluation for readers new to voice technologiesand keeps with in-depth details on implementation, conceptsand protocols, name keep watch over types to be had, roadblock andtroubleshooting options, and QoS matters. The booklet additionally expandsbeyond the curriculum to hide subject matters similar to WRR, AutoQoS on aCatalyst change, LFI, utilizing MQC to configure category, marking,LLQ, WRED, policing, and shaping. How does the ebook vary from theprevious variation? It contains up-to-date assurance of voice technologies,IOS model 12.3 updates together with AutoQoS, H.323 improvements, MGCPenhancements, and SIP improvements, and useful editorial elementslike hands-on lab routines and configuration examples are givengreater emphasis.
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Extra resources for Cisco Voice over IP CVoice) Authorized Self-Study Guide
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. Note Echo tolerance varies. For most users, however, echo delay over 50 ms is problematic.
Recognize the request for service 2. Process dialed digits 3. Route the call 4. Supervise the call 5. Terminate the call Centralized Call Control Centralized call control, an example of which is illustrated in Figure 1-15, allows an external device (call agent) to handle the signaling and call processing, leaving the gateway to translate audio signals into voice packets after call setup. The call agent is responsible for all aspects of signaling, thus instructing the gateways to send specific signals at specific times.
In a distributed call processing environment, the components of the voice network at each location can act independently. Figure 1-25 depicts an enterprise centralized call processing environment. Centralized voice networks provide enterprise-wide voice access for calls and voice services controlled from a central site. In this environment, the central site provisions all voice services, such as Cisco Unified CallManager, voice mail, and unified messaging. IP phones at remote sites connect to Cisco Unified CallManager through the IP WAN for call processing.