asterisk users - Jan 2005 - voice quality with asterisk

hello list ,

my set up is like this


ip device -->ser ---> asterisk(astcc) --> pstn gatewsy

my asterisk version is 1.0.2

iam using the ser as registration and asterisk aa the 

prepaid one with the help of the astcc.

now my problem is the destination people 


i.e  the pstn line s are listening low voice 

and also the blurr sound quality along with 

the audio of the ip device at the destination side 

of the pstn line s 

iam useing the open g729 and ulaw and alaw as codecs

so what may be problem 

iam not keeping any overheards on the asterisk box

by not ruuning other services

iam giveng bandwidth of more that 512 kbs to asterisk 

box

so any body can suggest any new things to done to
improve the sound quality

with regards

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voip technocrat wrote:
> hello list ,
Hello!

:-)
> my set up is like this
> 
> ip device -->ser ---> asterisk(astcc) --> pstn gatewsy
> my asterisk version is 1.0.2
Latest stable package is 1.03 with 1.04 to be released very shortly :-)
> iam using the ser as registration and asterisk aa the 
> prepaid one with the help of the astcc.
> now my problem is the destination people 
> i.e  the pstn line s are listening low voice 
You need to let us know what devices you are using.
> and also the blurr sound quality along with 
> the audio of the ip device at the destination side 
> of the pstn lines 
As above.
> iam useing the open g729 and ulaw and alaw as codecs
No such thing as open g729.  G729 is a patented codec.  If you are using 
it in a nation with a government, chances are that the patent is upheld. 
(People - don't flame on this, we all know everybody's opinions on the 
topics of codec patents)
> so what may be problem 
> 
> iam not keeping any overheards on the asterisk box
> by not ruuning other services
So there is nothing else running on the Asterisk box?
> iam giveng bandwidth of more that 512 kbs to asterisk 
With Quality of service?  Are there any packet drops?
> so any body can suggest any new things to done to
> improve the sound quality
As above, let us know what devices you are using.  I would say that the 
PSTN GW is the likely culprit.  Does it have any settings for 
receive/transmit gain adjustment?

-- 
Cheers,

Matt Riddell
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