estimating VoIP data traffic size from VoIP signaling traffic size ?
Bill Woodcock
woody at pch.net
Sat Oct 22 17:34:14 UTC 2005
> is there any statistics on aggregated VoIP signaling
> bandwidth and aggregated VoIP data bandwidth? eg. if
> we monitored there is 2Mbps(average) traffic on VoIP
> signaling protocol ports ( including SIP, H.323,
> MGCP), how could we estimate average VoIP data
> bandwidth?
For any given user population, you could calculate the ratio, but that's
an observation, not a predictive rule. And it would be different for
every population.
On the other hand, if you have access to the signaling traffic, it
_contains_ the statistics about the data traffic. Byte-counts, times,
loss, latency, jitter, and out-of-order delivery. All right there in each
SIP-Bye message. Which, of course, you aren't guaranteed to see, but
there again, you can extrapolate from knowing what portion you are seeing.
-Bill
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