you can set the global var send_silence_when_idle=true in vars.xml<br><br><br><div class="gmail_quote">On Mon, Jul 27, 2009 at 4:23 PM, Keith Laaks <span dir="ltr"><<a href="mailto:keithl@voxtelecom.co.za">keithl@voxtelecom.co.za</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p>Hi All,</p>
<p> </p>
<p>I am testing a range of G722 capable DECT based CPE.</p>
<p>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.</p>
<p>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.</p>
<p>The same unit using G729, alaw or ulaw works 100%.</p>
<p> </p>
<p>I wonder if anybody else has uncounted this issue?</p>
<p> </p>
<p>My guess at this point –</p>
<p>There may be a short break in the RTP between the separate files
being played out by FS that makes up any menu. </p>
<p>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).</p>
<p>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.</p>
<p> </p>
<p>Looks like in these devices the G722 encode/decode is
actually done in the DECT handset and not the voip-base unit.</p>
<p> </p>
<p>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’.</p>
<p> </p>
<p> </p>
<p>Best Regards</p>
<p><span style="font-size: 10pt; color: black;"> </span></p>
<p><span style="font-size: 10pt; color: black;">Keith</span></p>
<p> </p>
</div>
</div>
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