[Freeswitch-users] Distortion on approx first 200ms of G722 prompts on DECT based CPE

[Anthony Minessale]

you can set the global var send_silence_when_idle=true in vars.xml


On Mon, Jul 27, 2009 at 4:23 PM, Keith Laaks <keithl at voxtelecom.co.za>wrote:

>  Hi All,
>
>
>
> I am testing a range of G722 capable DECT based CPE.
>
> With one range, I have noticed that the first 200ms or so of each separate
> prompt file being played back is played out distorted from the DECT handset.
>
> When having a normal conversation, the quality is excellent, but when
> accessing your vmail, all the individual audio files making up the menu
> choices exhibit the distortion, which is pretty annoying.
>
> The same unit using G729, alaw or ulaw works 100%.
>
>
>
> I wonder if anybody else has uncounted this issue?
>
>
>
> My guess at this point –
>
> There may be a short break in the RTP between the separate files being
> played out by FS that makes up any menu.
>
> During this time the DECT handset’s AGC probably goes to MAX amplification
> (as its not receiving any input during the short break in RTP).
>
> Then, when the RTP returns at the start of the next file, the AGC boosts
> the audio into clipping zone and takes 200ms to dampen down back to normal
> good levels.
>
>
>
> Looks like in these devices the G722 encode/decode is actually done in the
> DECT handset and not the voip-base unit.
>
>
>
> Is there any parameter that can be set in FS to ensure that the RTP keeps
> flowing, sending ‘silence’ between prompts ? Would be interesting to
> validate the above ‘guess’.
>
>
>
>
>
> Best Regards
>
>
>
> Keith
>
>
>
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>


-- 
Anthony Minessale II

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