<div dir="ltr"><div>Hello Steve,</div>
<div> </div>
<div>  Thanks for clarifying it.</div>
<div> </div>
<div>                     __Yehavi:<br><br></div>
<div class="gmail_quote">2011/2/20 Steve Underwood <span dir="ltr">&lt;<a href="mailto:steveu@coppice.org">steveu@coppice.org</a>&gt;</span><br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Hi Yehavi,<br><br>Section 3.2 of RFC2833 is poorly worded, and causes a lot of issues in<br>the real world. The first paragraph says you can choose to send both<br>
audio and events, but doesn&#39;t clarify how. Presumably RFC2198 should be<br>used. Is your system using RFC2198 encoding? I doubt it. The second<br>paragraph talks about tone onset getting through as audio. Valid DTMF<br>
can be as short as 45ms, so 60ms is far more than anything which might<br>be termed onset. Because they didn&#39;t specify anything about what is<br>tolerable as tone onset passing through the channel as audio we have<br>
chaos today.<br><br>RFC2833 is an obsolete spec, and we should be talking about RFC4733<br>today. Section 2.5.1.3.1 of RFC4733 does clearly call for combined<br>payloads to be sent as RFC2198 packets. RFC4733 is even vaguer about the<br>
onset issue, though.<br><br>Steve<br>
<div class="im"><br><br>On 02/20/2011 06:33 PM, Yehavi Bourvine wrote:<br>&gt; Hello Steve,<br>&gt;  I uderstand from paragraph 3.2 in RFC-2833 that the sender may send<br>&gt; some audio of the DTMF while sending the events, until it revognises<br>
&gt; that this is a DTMF tone. The 60mSec is what I&#39;ve been told by Vega<br>&gt; engineers.<br>&gt;                                Thanks! __Yehavi:<br>&gt;<br></div>&gt; 2011/2/20 Steve Underwood &lt;<a href="mailto:steveu@coppice.org">steveu@coppice.org</a> &lt;mailto:<a href="mailto:steveu@coppice.org">steveu@coppice.org</a>&gt;&gt;<br>

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<div class="h5">&gt;<br>&gt;     On 02/20/2011 03:31 PM, Yehavi Bourvine wrote:<br>&gt;     &gt; Hello,<br>&gt;     &gt;   Anyone has an experience with the above configuration? All<br>&gt;     sides are<br>&gt;     &gt; marked as RFC-2833 and the Sonus recognises most of the DTMF&#39;s<br>
&gt;     twice.<br>&gt;     &gt; The Vega sends both RFC-2833 events and about 60msec of the DTMF<br>&gt;     tone<br>&gt;     &gt; (according to Vega&#39;s engineers it takes it about 60 msec to<br>&gt;     detect the<br>
&gt;     &gt; DTMF tones).<br>&gt;     &gt; According to the RFC this is acceptable. The service provider I am<br>&gt;     &gt; working with says that it shouldn&#39;t be like that. Before I waste<br>&gt;     time<br>&gt;     &gt; in wars, has anybody had this issue and knows whether it is a matter<br>
&gt;     &gt; of configuration at the Sonus side?<br>&gt;     &gt;                                    Thanks! __Yehavi:<br>&gt;     Are you saying the Vega sends 60ms of DTMF as audio, then sends<br>&gt;     RFC2833<br>&gt;     DTMF packets and mutes the audio? In what reading of the RFC is that<br>
&gt;     considered appropriate action? In addition, a DTMF detector should<br>&gt;     detect is more like 40ms. 60ms is rather long.<br>&gt;<br>&gt;     Steve<br>&gt;<br>&gt;<br>&gt;     _______________________________________________<br>
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