[Asterisk-Users] .gsm voice format

[Steven Critchfield]

On Mon, 2003-07-14 at 11:25, Dan wrote:
> Hi,
> 
> > The question about transcoding, if you are going to PSTN via a hardware
> > interface, then you might want to store your audio in alaw or ulaw
> > format,
> 
> It is possible to use Voicemail prompts in alaw or ulaw format?

Yes, just run through the prompts directory and let sox convert them.
You may wish to pull the gsm copies to make sure the wqv copies are
used. 

> ----- Original Message ----- 
> From: "Steven Critchfield" <critch at basesys.com>
> To: <asterisk-users at lists.digium.com>
> Sent: Monday, July 14, 2003 6:10 PM
> Subject: RE: [Asterisk-Users] .gsm voice format
> 
> 
> > On Mon, 2003-07-14 at 09:47, Scott Stingel wrote:
> > > Ok, thanks.
> > >
> > > I should have asked this in the first place: what I'm really getting at
> is
> > > that I need to record (or convert) prompts in many languages.  I have a
> > > number of Windows based tools to do this.  I want to end up with prompts
> > > that asterisk can play with the least CPU effort, ie. without
> transcoding.
> > > Would this be the gsm format?  If so, it sounds like I should record in
> Wav
> > > format, 8-bit samples?  How to convert to gsm?
> >
> > First learn sox, it will save you a lot of time dealing with format
> > conversions. Next record at 8bit 8k so that what you hear on the
> > speakers is the same as what will go out to the phone. Then realize that
> > if you record via PCM and let sox convert to whatever you like, you will
> > be well off.
> >
> > The question about transcoding, if you are going to PSTN via a hardware
> > interface, then you might want to store your audio in alaw or ulaw
> > format, if it is VoIP then whatever codec you might use there, or again
> > alaw/ulaw so it is a one hop conversion.
> > -- 
> > Steven Critchfield  <critch at basesys.com>
> >
> > _______________________________________________
> > Asterisk-Users mailing list
> > Asterisk-Users at lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-users
> >
> >
> 
> 
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-- 
Steven Critchfield  <critch at basesys.com>