June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Legacy Trunks
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Legacy Trunks
Legacy trunks are links that connect private voice switches using a traditional tech-
nology like FXO/FXS or T1. There may be many reasons why you use legacy trunks,
even if your heart’s desire is to move totally to VoIP:
• Legacy trunks are the only way to integrate legacy PBXs with VoIP systems.
• Existing legacy trunks, especially point-to-point T1s, may be subject to service
contracts that require you to maintain them for a while—sometimes as long as
seven years from the date of inception.
• Legacy trunks are known for quality. Since they derive from the circuit-switched
PSTN, legacy trunks have intrinsic bandwidth guarantees. If you can’t justify (or
convince other decision-makers on) the merits of packet-switched QoS across
your private network, then legacy trunks provide a solid connection between
voice switches.
Private Analog Lines
If two PBXs are in the same building or on the same campus, they can be connected
by analog copper and FXO/FXS interfacing. This technique is effectively the same as
that in Project 12.2 that linked two softPBXs using a POTS line. The difference in
this case is that you aren’t using the PSTN; you’re just using a standard telephone
cable with RJ11 connectors on both ends. One end connects to an FXO/FXS port on
each PBX. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.