June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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VoIP Trunks
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293
If you have T1 links that have very long contract periods remaining,
you might have to keep them in place even if your endgame is to
replace them with VoIP-based trunks. Some phone companies will
assess a hefty termination liability fee if you cancel your T1 lease
before it’s up!
VoIP Trunks
As you know, a VoIP trunk uses digitized voice in IP packets to link two PBX serv-
ers. VoIP trunks can replace legacy trunks only when the two PBXs being linked are
VoIP-enabled. A VoIP trunk could run between two IP-enabled PBXs, like the Avaya
S8700 and a Nortel Meridian, or between two legacy PBXs that have outboard VoIP
media conversion. Outboard conversion devices, like Cisco media gateways, allow
legacy PBXs to connect to the local Ethernet network and perform the voice packetiz-
ing for the VoIP network since the PBX can’t on its own. (The cost of outboard con-
version often helps build the case for using VoIP-enabled or native VoIP softPBXs
instead.)
Like other IP protocol families, VoIP can be tunneled within VPNs and GRE (generic
routing encapsulation)point-to-point tunnels. By now, you know it can be routed,
switched, and load-balanced. These qualities, inherited from the Internet-like net-
works that came before it, give VoIP’s trunks greater flexibility than legacy trunks. ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.