[*] codecs within asterisk

[Jason Lee]

Hey,

G.711 also known as ulaw, or pcmu (known as G.711 hens forth) IS the
same codec that is used on the PSTN for voice T1. GSM is more along the
quality of cellular service, another popular codec is G.729 and is
closer to the quality of GSM.

G.711 is 64 kbps but once you tack on ethernet and IP overhead you end
up with 95.2kbps (one way)

25 active calls at one time would use 2.38mbps in both directions. And
also once you go over half your available bandwidth your latency also
starts to increase. With 320kbps up you would be able to have 3 calls at
one time.

Regards,

Jason Lee

Bill Reid wrote:
> Travis Harper wrote:
>   
>> It really depends on your setup.
>> How much bandwith do you have, and how many accounts on your server, or 
>> how many users.
>> Ulaw give near telco quality, but uses more bandwidth.
>> I use it with 3mb down and 40k up, with about 25 accounts.
>> Works ok for me...as long as all accounts are not placing calls at the 
>> same time.
>>     
>
> Hi Travis,
>
> Something does not compute. Ulaw(G711) needs about 88Kbps. Do you mean 
> 40kBps(i.e. bytes not bits)?  320Kbps up. I realize that you did not actual say 
> whether it was bits or bytes but I assume you were quoting 3m bits per sec down.
>
>
> -- Bill
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