<div>The SIP Trunk is directly connected to the CUCM (7.X). So there is no ISR, or CUBE in between. </div>
<div>The System Guide of CUCM 7.X states that only the 7971 7975 support RFC2833. Currently I'm running the test with 7941 and 7961 phones. Also all regions are set to use g.711 and there is no MRGL associated to the Device Pools of the phones and the SIP Trunk.</div>
<div> </div>
<div>If I try setting up a call and run the RTMT tool I don't see the CUCM using any MTP's. The SBC which is used isn't a Cisco CUBE.. but I've lost the name, I thought it was a NextTone or something.</div>
<div> </div>
<div>- Paul<br><br></div>
<div class="gmail_quote">2010/6/1 Ryan Ratliff <span dir="ltr"><<a href="mailto:rratliff@cisco.com">rratliff@cisco.com</a>></span><br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">What phones do you have? Most of them do in fact support RFC2833.<br>Additionally, using g.711 for rtp the software MTP resources on your CUCM can convert the dtmf just fine.<br>
<br>Even if you are using g729 you can use a software MTP on the router acting as your CUBE to do the necessary dtmf conversion which doesn't require any hardware DSPs.<br><br>-Ryan<br>
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<div></div>
<div class="h5"><br>On Jun 1, 2010, at 4:34 PM, Paul van den IJssel wrote:<br><br>> Hi Guys,<br>><br>> Currently I'm testing a SIP Trunk with our ISP. Everything is working fine but I don't get the DTMF to work. This because my SCCP phones only support OOB DTMF. So to get it to work with SIP RFC2833 (in-band) I need an expensive transcoder. But now we've set the SIP Trunk to SIP Notify (out-band) which should work with the IP Phones OOB, but all I get is 'SIP/2.0 403 Forbidden'.<br>
><br>> How do I get this to work without the use of a hardware Transcoder?<br>><br>> Best regards,<br>><br>> Paul van den IJssel<br>> Digacom<br></div></div>> _______________________________________________<br>
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