VoIP: Stack the deck to win or lose

ITworld.com |  Networking

If you're in the Fortune 1000 and your firm doesn't have a VoIP (voice over IP)
pilot project currently in the works, you're already behind the times. When upper
management demands to know what you're doing about "this IP telephony thing," what are
you going say?

Say, "All I need is $80,000 and six months, and we'll be ready to roll."

Now, you might actually be able to get by with $50,000. And I've seen a few VoIP
pilots get off the ground in just three or four months. But it never hurts to build in
a little buffer.

Once you've bought the time, you can decide whether you want your pilot program to

Go out and get two low-end VoIP gateways. If you want to go with the market leaders,
there's Cisco's AS5300/Voice Gateway or Lucent's href="http://www.lucent.com/ins/products/multivoice/multivoiceformax.html">
MultiVoice for the href="http://www.lucent.com/ins/products/max/max6000.html">Max 6000. But what kind
of network do you connect them over?

Here's where you can stack the deck. If you don't want to be bothered with VoIP any
more, connect two of your corporate VoIP sites over the Internet -- via two different
ISPs, if you can arrange it.

Here's what will happen: Between 30 to 70 percent of the time, realtime phone calls
will work just fine. But the rest of the time, latency and jitter will drive your pilot
testers nuts.

But let's say you want your VoIP pilot to really sing. Then connect your two VoIP
pilot sites over your own intranet (that's your private backbone data network). This
assumes your private IP backbone is well-managed and behaved; I've seen a few that are
worse basket cases than the Internet itself.

VoIP gear will add about 80 to 90 milliseconds of one-way latency. If you make sure
the network consistently adds no more than about 30 to 40 milliseconds (that's like
cross-country propagation with a few high-speed router hops), and keep total one-way,
end-to-end latency consistently under about 120 milliseconds, your VoIP users will be
impressed with call quality, and your management will be impressed with you.

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