[Asterisk-Users] What is the highest quality codec I can use for recording voice messages?

[Fats Neutron]

On 15/8/03 18:57, "WipeOut ." <wipeout at linuxmail.org> wrote:

>> I was interested in getting the highest quality over a normal phone line
>> because I want users to be able to record their messages at the highest
>> quality. They do it not me hence my question about the highest quality
>> codec.
>> 
>> If for example they used VoIP software on a computer could they get higher
>> quality than over a normal phone line?
>> 
>> If they did use a normal phone line can I increase the quality of is this a
>> limitation at the carriers end?
>> 
>> Any help would be appreciated.
>> 
>> Thanks.
>> Fats.
>> 
> 
> Using alaw or ulaw over VoIP will give you best quality you are going to get
> over VoIP.. If your PSTN carrier is giving a bad quality line then you should
> probably change carrier... :)
> 
> Most prompts will be converted to GSM files anyway so that will be the quality
> of the end result..
> 
> I wouldn't worry about it too much, just record some and take a listen, they
> should be fine..
> 
> Later..

Thanks for the fast reply.

I assume you mean that alaw or ulaw is what the carrier delivers. Because my
customers use the phones they have I do not have control over the carrier
they use, I just meant it to mean all carriers. As in what is the standard
format they deliver in.

I assume that I have no control over how they deliver but at the Asterisk
end I wanted to ensure the highest quality recording.

If I used a direct connection from one computer to asterisk could I increase
the quality by using a different codec, assuming they have broadband access
at their end. I have read that the g711 is the highest quality in the sample
rate but was not sure if this would still work with Asterisk or if I should
use G729 as it seems to be double the bandwidth sampling at between 8 and 12
kps whereas g711 seems to sample at 64kbs but that may flood the connection.

Any ideas?

Thanks
Fats.