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
• Access interfacing, so that traditional phones and PBXs can participate in the
VoIP network by way of media conversion.
• Translation of audio encoding standards (codecs) in real time to facilitate calls
between endpoints that have different audio capabilities or between analog, digi-
tal, and IP endpoints.
When VoIP endpoints and servers are connected to the same IP network, VoIP
becomes the call-switching and voice-transmission mechanism, replacing the tradi-
tional PBX.
What differentiates VoIP servers from voice endpoints is whether they provide a user
interface for the telephony application. Phones do, so they are endpoints. Switches,
ATAs, PSTN gateway devices, and other specialized VoIP devices don’t, so they are
VoIP servers. Another differentiator between endpoints and servers is their abun-
dance on the network. Like the WWW, there are more endpoints than servers in a
VoIP system, sometimes even in thousands-to-one ratios.
Voice Endpoints
Endpoints that are TCP/IP aware (that is, they are valid hosts on the IP network) and
connect directly to a data link that carries TCP/IP (such as Ethernet) are usually
called IP phones. IP phones resemble feature-enriched business telephones but differ
in that they usually have ...
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