[*] codecs within asterisk

[Travis Harper]

Well we do get more than 3 calls at a time.
During peak times we occasionally get some crackles.
Can't confidently quote how many calls it takes, but I know we are  
consistently over 3 calls at a time and quality is quite good.

Sent from my iPhone

On 10-Oct-08, at 11:22 PM, Jason Lee <jlee at omegaserv.com> wrote:

> 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
>> _______________________________________________
>> Asterisk mailing list
>> Asterisk at muug.mb.ca
>> http://www.muug.mb.ca/mailman/listinfo/asterisk
>>
>
>
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