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Chapter 8. VoIP Networking > Review Questions

Review Questions

1:What is the goal of the simplest VoIP home-office LAN components?
A1: Answer: To enable reduction of long-distance and international telephone charges.
2:What do A-Law and Mu-Law describe?
A2: Answer: How the dynamic range of a voice signal is compressed and expanded while minimizing noise. Mu-Law is more universal than A-Law.
3:What is a codec?
A3: Answer: A codec is a coder/decoder that translates analog voice signals into a digital stream of data. Codecs can compress the signal to a very low bps digital stream.
4:Why use a VoIP PBX?
A4: Answer: A VoIP PBX can bring together VoIP phones and PBXs in local and remote offices so that they function as one single, large PBX. This is especially good for call centers using telecommuters.
5:What SOHO LAN is supported by VoIP components?
A5: Answer: Ethernet is the SOHO LAN used by VoIP components. Virtually all VoIP components work with 10 Base T Ethernet and some work with 100 Base TX Ethernet.
6:What are some functions of a VoIP PBX?
A6: Answer: Some functions of a VoIP PBX are translating voice in IP packets to 64 Kbps PSTN voice, interfacing with PSTN signaling, interconnecting with other VoIP systems servicing other Private Integrated Services Network Exchanges (PINX), and supporting a variety of telephone and network interfaces.


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