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Correct Answers
1. The first Internet-telephony software, Internet Phone, supported PC–to–PC and telephone-to-telephone voice calls via the Internet.
a.
true
b.
false
2. The current reliability and sound-quality problems of Internet telephony are attributable to limitations in Internet bandwidth and compression technology.
a.
true
b.
false
3. As a packet-switched or connectionless network, the Internet decreases the chances of packet loss for a voice call.
a.
true
b.
false
4. To date, most developers of Internet-telephony software and vendors of gateway servers have used the same speech-compression protocols.
a.
true
b.
false
5. The ITU has ratified a standard for voice, data, and video transmission over IP–based local area networks.
a.
true
b.
false
6. ITU's H.320 standard defines the protocols for transporting voice, data and video over:
a.
PSTN
b.
ISDN networks
c.
the public Internet
7. The G.723.1 specification for audio codecs, recommended by the VoIP Forum, requires:
a.
6.3 kbps
b.
7.9 kbps
c.
8.4 kbps
8. Internet-telephony directories enable:
a.
users to determine other users' Internet addresses
b.
users to determine whether an Internet site is capable of receiving Internet-telephony transmissions
c.
Internet/PSTN Interoperability
9. In the near term, the market segment expected to be the biggest driver for VoIP telephony is:
a.
small-office/home-office (SOHO) customers
b.
military/government networks
c.
corporate intranets/extranets
10. The public Internet will be able to transport voice calls reliably and with high quality when:
a.
standards are established for Internet directories
b.
manufacturers produce higher-quality, lower-cost audiocodec technology
c.
various technologies deliver greater backbone-network and subscriber-access speeds
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TABLE OF CONTENTS:
Definition and Overview
1 Introduction
2 Intranet Telephony Paves the Way for Internet Telephony
3 Technical Barriers
4 Standards
5 Future of Voice-over-Internet Protocol (VoIP) Telephony
Self-Test
Correct Answers
Glossary
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