But who in there right state if mind would use ulaw?
Just take them away to the funny farm ha ha ho ho!! :-P
gsm, ilbc, g729 etc are a lot better choice.
Best regards,
Al Bochter
Bochter Services
http://www.BochterServices.com/?t=Email
(VoIP PBX) 1-866-638-1254
For Information on PBX Systems for SOHO
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Steve Edwards wrote:
This may expose my ignorance, but here goes :)
I've been asked to figure out how much bandwidth would be needed to
handle 1,000,000 minutes a month.
Here's the environment:
) All calls are received via SIP.
) All calls use the ulaw codec.
) Calls average 10 minutes in duration.
) The "busiest" hour will account for 10% of the daily total.
This is how I'm figuring it...
Casual observation shows that SIP setup and teardown takes about 26
UDP packets. Assuming the packets are full (512 bytes) this adds up to
about 13 kilo-bytes for each call.
I've heard that ulaw (including overhead) is supposed to take about 80
kilo-bits/sec.
Assuming each call takes 10 minutes, each call will take 13 kilo-bytes
+ (80 kilo-bits * 60 * 10) or 48.13 mega-bits. Assuming (to make the
math easier) 10 bits = 1 byte, each call will take 4.813 mega-bytes.
So, 100,000 calls of 10 minutes (1 million minutes) would consume
481,300 mega-bytes per month or 3,333 calls consuming 16,043
mega-bytes per day.
Assuming the busiest hour accounts for about 10% of the daily total,
that hour would consist of 333 calls consuming 1,604 mega-bytes.
So, my "peak" would need 4.5 mega-bits per second of bandwidth.
Am I in the ballpark?
Would anybody venture an estimate of what the peak bandwidth would be
if we changed to IAX? With trunking?
Thanks in advance,
------------------------------------------------------------------------
Steve Edwards [EMAIL PROTECTED] Voice: +1-760-468-3867 PST
Newline Fax: +1-760-731-3000
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