June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Chapter 4: Circuit-Switched Telephony
Outboard analog media gateway
A device that serves the same purpose as an ATA, but allows more than one ana-
log phone to be used. Some analog media gateways are highly expandable and
can support dozens of analog endpoints. Analog media gateways may also have
some built-in call-routing functionality.
Onboard analog media interface
An interface port on the softPBX server itself that allows for direct connection of
a single analog phone.
Of course, analog endpoints are more than just phones. Sometimes they are
modems, fax machines, answering machines, burglary or fire alarm systems, or those
automated dialers with prerecorded telemarketing messages that sometimes call and
interrupt your dinner. Generally, analog endpoints can be connected to a VoIP net-
work using one of the three mechanisms listed.
But many data transmission protocols used by faxes and modems are broken by the
voice digitization process used on VoIP networks. Quantization, as described in the
earlier section “Time Division Multiplexing,” has a knack for screwing up the analog
sound wave signals used by modems and faxes to represent data. But don’t fret—
there’s a solution to this problem, and it’s covered in Chapter 14.
Digital Endpoints
Digital phones are functionally similar to
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