<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>6 dec 2012 kl. 22:52 skrev Michael Collins <<a href="mailto:msc@freeswitch.org">msc@freeswitch.org</a>>:</div><br class="Apple-interchange-newline"><blockquote type="cite">Bummer. I'm not aware of any way to ignore those. Anyone else have ideas?<br></blockquote><div><br></div><div>The problem with ignoring DTMF in RTP is that it will delay audio, always. Let's say you want to delete all DTMF shorter than 1200 ms.</div><div>We receive a DTMF begin packet, then will have to wait to 1220 ms to see if the DTMF CONTINUE packets continue or if we actually get a DTMF END packet arriving in time. If it does, we'll delete the DTMF - but that</div><div>will produce a gap in the audio we will have to fill. If it is longer than 1200 ms we will start playing it out on the other side of the call bridge.</div><div><br></div><div>You seriously do not want to delay audio 1200 ms. Not even 100 ms.</div><div><br></div><div>There no simple solution to this. We've had issues with GENBAND servers and their DSPs that send short DTMF in calls with</div><div>female voices. </div><div><br></div><div>In short. When we receive the start of the DTMF we have no idea about the duration. We can't make a decision until it's too late to make a decision... If you just focus on delaying DTMF, you will start playing DTMF on top of audio, cancelling out parts of the conversation.</div><div><br></div><div>/O</div><br><blockquote type="cite">-MC<br><br><div class="gmail_quote">On Thu, Dec 6, 2012 at 12:59 AM, Regis M <span dir="ltr"><<a href="mailto:regis.freeswitch.org@tornad.net" target="_blank">regis.freeswitch.org@tornad.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br><br>It's RFC2833 DTMF, not inband.<br><br>Regards,<br> <div class="gmail_extra"><br><br><div class="gmail_quote">
2012/12/5 Michael Collins <span dir="ltr"><<a href="mailto:msc@freeswitch.org" target="_blank">msc@freeswitch.org</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Are they sending those digits inband or with RFC2833? <br>-MC<br><br><div class="gmail_quote"><div>On Wed, Dec 5, 2012 at 11:28 AM, Regis M <span dir="ltr"><<a href="mailto:regis.freeswitch.org@tornad.net" target="_blank">regis.freeswitch.org@tornad.net</a>></span> wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Hi,<br><br>We have a bugged provider that send us throw RTP wrong DTMF
during call. It seems that wrong DTMF are shorter than 1200ms (about
90%) so I want to try to ignore them.<br>For the moment, FS catch them and send it back to the bridged side, boring user.<br><br>switch_rtp.c:<a href="tel:3410" value="+333410" target="_blank">3410</a> RTP RECV DTMF C:552<br>
<br><br><br>Does min-dtmf-duration will make FS ignore them and not RECV them ?<br>
I saw the DTMF in "normal" RTP packet, but no digit was pressed in user side.<br><br>It's commented in my FS switch.conf.xml, how can I see the current value ?<br><!--<param name="min-dtmf-duration" value="400"/>--><br>
<br><br>Any other idea ?<br><br>thanks
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