By Kevin Wallace
Grasp the fundamentals of VoIP (Voice over IP) implementation with theCisco licensed self-study publication for CVOICE starting place 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 tougher elements 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 all of the serious info had to enforce andsupport information and voice integration strategies on the network-accesslevel. additionally, this publication prepares the reader for the CVOICEcertification examination 642-432, which applies to a number of Cisco IPTelephony professional certifications and the Cisco qualified VoiceProfessional (CCVP) certification. The publication is predicated at the 5.0curriculum, and has additional insurance on quite tricky parts ofthat direction, resembling H.323 gateway/gatekeeper and QoS configuration.This e-book will serve readers as a useful examine reduction and aninvaluable concept, configuration, and troubleshooting reference.Coverage begins with a overview for readers new to voice technologiesand keeps with in-depth info on implementation, conceptsand protocols, name keep watch over versions on hand, roadblock andtroubleshooting innovations, and QoS matters. The ebook additionally expandsbeyond the curriculum to hide subject matters equivalent to WRR, AutoQoS on aCatalyst change, LFI, utilizing MQC to configure class, marking,LLQ, WRED, policing, and shaping. How does the ebook fluctuate from theprevious version? It comprises up to date insurance 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 workouts and configuration examples are givengreater emphasis.
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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. Also, the centralized call control model can leverage Cisco's Survivable Remote Site Telephony (SRST) feature to provide redundancy in the event of a WAN outage by having the voice-enabled router at the remote site perform basic call processing functions.
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. There are two ways to solve an echo problem in your telephone network: • Echo suppression • Echo cancellation The echo suppressor, as depicted in Figure 2-22, works by transmitting speech in the forward direction and prohibiting audio in the return direction.
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. Figure 2-23. Echo Cancellation Rather than breaking or attenuating the return path (as in echo suppression), echo cancellation uses a special circuit to build a mathematical model of the transmitted speech pattern and subtracts it from the return path.
Cisco Voice over IP CVoice) Authorized Self-Study Guide by Kevin Wallace