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Planning for VOIP Traffic Loads
If you set this beside my earlier post about Beckman Coulter's experience, in which raw bandwidth served the purpose, you get not so much a contradiction as an illustration of Josh's point: These things are highly experiential: You might be able to deploy VOIP on your WAN and get quality that's just fine by doing nothing other than boosting bandwidth. But:
1.) That may or may not be the long-term answer; and
2.) That may or may not be the right answer for someone else.
So it seems to me that if you can get by on bandwidth alone, count yourself lucky but don't get too comfortable.