asterisk users - Apr 2010 - IVR menu sound processing for AMR and GSM + live test available

Hi!
We are in process of setting up an audio guide that will cover notable places of
our capital Riga, Latvia.
The target audience are tourists that dials a free phone number from a mobile
handset to listen to a 3 minute introduction to historic place.
All audio, 10+ languages are recorder in studio at 44KHz. The audio is stored on
server in A-law 8KHz because we'll be pushing it through E1 line.

I need an advice on improving audio quality taking in account that callers will
use cell phones that are most likely in 3G network coverage. So it means, I
believe, either AMR NB or GSM EFR.
Any hints on pre-filtering and volume normalization techniques that could be
beneficiary in this case?
Currently, a Sony Sound Forge speech preset -10dB is applied to normalize the
volume (AFAIK) and then audio is re-sampled with SOX -t raw -e a-law -r 8000 -c
1
Free and commercial software recommendations are fine.

It would be essential to get your comments (in email or by leaving a voice
message) about sound quality if you could call the menu at
sip:123 at riga.beta.lv (actually, any number at riga.beta.lv)

I'm not a sound processing expert, nor I believe people performing the
recording
are IVR professionals. So please keep that in mind.
It looks likes there are some problems with English and Norwegian languages.

We also need a person who speaks Dutch language to perform a ~1h recording.
This is price sensitive assignment because the project itself is close to
non-commercial.

01 through 11 will select the language.
Then 0000 through 0013 will select the place.
You can press # to go up one level, and * will take you to 30sec feedback
recording (only when you're listening to the guide or just right after
that).
Available languages are:
01=LV
02=EN
03=RU
04=DE
05=LT
08=NO
09=SE
10=PL
11=SP

not yet ready
06=EE
07=FI
12=FR
13=IT
14=AR
15=CN
16=JP
17=IN

On Fri, 9 Apr 2010, Arkadi Shishlov wrote:
> It would be essential to get your comments (in email or by leaving a 
> voice message) about sound quality if you could call the menu at 
> sip:123 at riga.beta.lv (actually, any number at riga.beta.lv)
I get:

     -- Executing Dial("SIP/501-0961b3a8", "sip/123 at
riga.beta.lv") in new stack
     -- Called 123 at riga.beta.lv
     -- Got SIP response 488 "Not acceptable here" back from
213.21.217.130
     -- SIP/riga.beta.lv-09623508 is circuit-busy

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000

On 04/09/10 05:08, Steve Edwards wrote:
> On Fri, 9 Apr 2010, Arkadi Shishlov wrote:
> 
>> It would be essential to get your comments (in email or by leaving a 
>> voice message) about sound quality if you could call the menu at 
>> sip:123 at riga.beta.lv (actually, any number at riga.beta.lv)
> 
> I get:
> 
>      -- Executing Dial("SIP/501-0961b3a8", "sip/123 at
riga.beta.lv") in new stack
>      -- Called 123 at riga.beta.lv
>      -- Got SIP response 488 "Not acceptable here" back from
213.21.217.130
>      -- SIP/riga.beta.lv-09623508 is circuit-busy
It was A-law only, on purpose.
Just added U-law to the list.