Age old question it seems but I haven't been able to get a handle on it yet. Let's assume I'm using a g729 codec. If I wanted to handle 20 simultaneous calls, how much bandwidth would I need? Is there a general formula for this?
I tried this caluclator:
http://www.voip-calculator.com/calculator/eipb/
I wasn't sure what "Packet Duration to select so I took the default 20ms (2 samples) - whatever that means. I plugged in 5 for the BHT (20 customers, each getting 3 X 5 minute calls/hour = 5 Erlangs) and the default 0.01 for the Blocking. It worked out to 264 kbps. Does this sound reasonable? If so great! A business DSL could support this.
Comments welcome!
Cheers,
H
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