By Kevin Wallace
Grasp the fundamentals of VoIP (Voice over IP) implementation with theCisco licensed self-study publication 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 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 severe info had to enforce andsupport facts and voice integration ideas 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 assurance on really difficult components ofthat path, reminiscent of H.323 gateway/gatekeeper and QoS configuration.This ebook will serve readers as a necessary research reduction and aninvaluable idea, configuration, and troubleshooting reference.Coverage begins with a overview for readers new to voice technologiesand maintains with in-depth details on implementation, conceptsand protocols, name keep an eye on versions on hand, roadblock andtroubleshooting thoughts, and QoS matters. The ebook additionally expandsbeyond the curriculum to hide themes akin to WRR, AutoQoS on aCatalyst change, LFI, utilizing MQC to configure type, marking,LLQ, WRED, policing, and shaping. How does the ebook fluctuate from theprevious variation? 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 sensible editorial elementslike hands-on lab routines and configuration examples are givengreater emphasis.
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Echo Although a local loop consists of two wires, when it reaches the switch, the connection changes to four wires with a two- to four-wire hybrid converter. Trunks then transport the signal across the network, as shown in Figure 2-20. Figure 2-20. Two-Wire to Four-Wire Conversion and Echo [View full size image] Telephone networks can experience two types of echo: • Acoustic echo Acoustic echo frequently occurs with speakerphones, when the received voice on the speaker excites the microphone and travels back to the speaker.
A good network design incorporates solutions for current requirements and allows room for future growth. It is important to understand how voice interfaces with a network and how the components fit together to provide service in any environment. 33 34 Analog Interfaces A Foreign Exchange Station (FXS) interface, as depicted in Figure 1-16, provides a direct connection to an analog telephone, a fax machine, or a similar device. From a telephone perspective, the FXS interface functions like a telephone switch (for example, a PBX); therefore, it must supply line power, ring voltage, and dial tone.
In Europe and Mexico, the E1 interface is most often used, while in the United States the T1 interface is most commonly used. Figure 1-20. E1 Interface 36 37 Although you can configure the E1 interface for either CAS or CCS, the most common usage is CCS. When an E1 interface uses CAS, signaling travels out of band in the signaling channel but follows a strict association between the signal carried in the signaling channel and the channel to which the signaling is being applied. The signaling channel is channel 16.
Cisco Voice over IP CVoice) Authorized Self-Study Guide by Kevin Wallace