[86086] in North American Network Operators' Group
Re: estimating VoIP data traffic size from VoIP signaling traffic
daemon@ATHENA.MIT.EDU (Bill Woodcock)
Sat Oct 22 13:39:57 2005
Date: Sat, 22 Oct 2005 10:34:14 -0700 (PDT)
From: Bill Woodcock <woody@pch.net>
To: Joe Shen <joe_hznm@yahoo.com.sg>
Cc: NANGO <nanog@merit.edu>
In-Reply-To: <20051022173449.94203.qmail@web53607.mail.yahoo.com>
Errors-To: owner-nanog@merit.edu
> 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
