[asterisk-users] Which cause less CPU usage: GSM or wav??

[Al lists]

Also your Disk subsystem speed.
having disk RAM , makes sense in your case.

On 9/10/07, Thomas Kenyon <digium at sanguinarius.co.uk> wrote:
>
> Barton Fisher wrote:
> > Thanks, OK, a bit confused....  The cards are TE410P.  I really don't
> > see how the set a codec for this, other than it might default to
> > something in code like ulaw.  Any clue on how to verify codec in use
> > during a call?
> >
> G.711ulaw and G.711alaw are the audio transmission methods used for
> ISDN. If you have a T1 line then the transmission method is G.711ulaw.
>
> I've been told that if you play a ulaw signal down an alaw line (T1
> signal down E1) then at the other end the voice sounds a bit like a
> dalek. (Iit's very hard to do this with asterisk since it automatically
> transcodes between endpoints).
>
> The lack of a performance hit is quite striking when you have a
> recording playing back as a native format rather than being transcoded.
> (well, it's quite striking when you have thousands of them running
> simultaneously).
>
> > Bart
> >
> > Steve Totaro wrote:
> >> Michiel van Baak wrote:
> >>
> >>> On 10:28, Sun 09 Sep 07, Barton Fisher wrote:
> >>>
> >>>> I have 4 TDM T1's going in to a IVR system.  The IVR messages are
> >>>> recorded .wav format - The system appears to crap out at about 40
> >>>> calls - Would using GSM or some other format help save CPU cycles?
> >>>> Using 1.2, Dual Xeon and 2GB ram
> >>>>
> >>> depends on what codec the T1 is using.
> >>> Best to transcode the ivr sounds to the same codec to
> >>> prevent on-the-fly transcoding by asterisk.
> >>>
> >>>
> >> The answer is going to ulaw or alaw depending where you live.  T1
> >> should most likely be using ulaw so make everything ulaw, end to end.
> >>
> >> Thanks,
> >> Steve Totaro
> >>
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