December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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Chapter 17: Network Convergence 533
PSTN
PBX
FIGURE 17.3 A conventional voice network uses the public switched telephone network (PSTN)
to carry telephone conversations between calling parties. Office private branch exchanges (PBXs)
connect phone calls between the PSTN and office extensions. PBXs also provide dialtone service and
switch calls between extensions within an office.
PBX
New York Office Los Angeles Office
Ethernet Switch
Router
Analog Phone
IP
Phone
PC
Phone
VoIP
PBX
VoIP
Switch
Internet
New York Office Los Angeles Office
Ethernet Switch
Router
Analog Phone
IP
Phone
PC
Phone
VoIP
PBX
VoIP
Switch
FIGURE 17.4 A LAN-based VoIP network completely bypasses the PSTN. ...
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