[asterisk-users] Bandwidth requirements for 1, 000, 000 minutes a month

[Al Bochter]

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
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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      sedwards at sedwards.com      Voice: +1-760-468-3867 PST
> Newline                                             Fax: +1-760-731-3000
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