June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Chapter 2: Voice over Data: Many Conversations, One Network
The distributed nature of VoIP applications makes them preferable to traditional
telephony on a wide area network—but that’s not the only advantage of VoIP on a
WAN. The other great benefit of VoIP—especially in a bandwidth-conservative
WAN—is compression.
The Core and the Edge
At the heart of a network resides the core, or network backbone. In modern IP net-
works, the core serves the purpose of transporting high levels of aggregate traffic
between nodes that are probably not endpoints—that is, they aren’t the hosts where
the traffic originated or the hosts where it is headed, but rather hosts whose purpose
is to forward that traffic along the core network until it needs an exit along the route
to its destination.
Figure 2-6. With a traditional PBX, voice transmission and call management are dependent upon a
route through the voice switch
Figure 2-7. In IP telephony, call management and signaling can be separated from voice
transmission
PBX
Caller Receiver
Call Management
Voice Transmission
Caller Receiver
Call Management
Voice Transmission
VoIP
Server
Caller Receiver
Call Management
Voice Transmission
VoIP
Server
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