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Correct Answers
1. The consolidation of separate voice and data networks offers an opportunity for _____________.
a.
utilization of extra broadband bandwidth for voice and data transmission
b.
reduced delay over a telephone call
c.
reduced computer and telephone hardware requirements
2. Voice-over-packet technology may be used to transfer information over both broadband and wireless networks.
a.
true
b.
false
3. A QoS issue unique to packet networks is _______________.
a.
interworking
b.
compression
c.
jitter
4. Signal reflections generated by the circuit that converts between a four-wire and a two-wire circuit can result in ___________________.
a.
jitter
b.
echo
c.
delay
5. Developers seeking to incorporate voice-over-packet technology face which of the following challenges?
a.
still-evolving technical standards
b.
network phenomena such as delay, jitter, echo, and lost packets
c.
integration of incompatible technologies
d.
all of the above
6. The fax-over-packet IWF reduces overall bandwidth because the fax transmission is _______________.
a.
half-duplex
b.
real time
c.
low-speed data
d.
only b and c
e.
all of the above
7. A major cause of problems in the transmission of fax-over-packet networks is _____________.
a.
properly dividing the four phases of the call
b.
incompatible fax machines
c.
using T.30 and T.4 protocols
d.
the timing related to the message interaction
e.
all of the above
8. Fax-over-packet software addresses the problems of lost frames by _______________.
a.
using an error-correcting protocol, such as TCP, to transport the fax data at the expense of added delay
b.
replaying last packets and other methods of interpolation
c.
repeating information in subsequent frames so that the error can be corrected by the receiver’s playout mechanism.
d.
only a and c
e.
all of the above
9. Processing delay is caused by the process of modulating and correcting the digital fax information into a packet for transmission over the packet network.
a.
true
b.
false
10. The fax network driver delays the data and performs which of the following?
a.
lost-packet compensation
b.
formatting of fax data
c.
removal of timing jitter from fax arrival times
d.
only a and b
e.
all of the above
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TABLE OF CONTENTS:
Definition and Overview
1 VoIP Applications
2 VoIP QoS Issues
3 VoIP–Embedded Software Architecture
4 Voice Packet Module
5 Signaling, Protocol and Management Modules
6 VoIP Summary
7 FoIP Applications
8 PSTN Fax-Call Procedure
9 FoIP QoS
10 FoIP Software Architecture
11 FoIP Summary
Self-Test
Correct Answers
Glossary
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