<div>Got it! It's a GenBand SBC. </div>
<div>In the SIP header I see that the CUCM supports both SIP NOTIFY and INFO.</div>
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<div>- Paul <br><br></div>
<div class="gmail_quote">2010/6/1 Nick Matthews <span dir="ltr"><<a href="mailto:matthnick@gmail.com">matthnick@gmail.com</a>></span><br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Software MTPs will do this.<br><font color="#888888"><br>-nick<br></font>
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<div class="h5"><br>On Tue, Jun 1, 2010 at 4:34 PM, Paul van den IJssel <<a href="mailto:pijssel@gmail.com">pijssel@gmail.com</a>> wrote:<br>> Hi Guys,<br>><br>> Currently I'm testing a SIP Trunk with our ISP. Everything is working fine<br>
> but I don't get the DTMF to work. This because my SCCP phones only support<br>> OOB DTMF. So to get it to work with SIP RFC2833 (in-band) I need an<br>> expensive transcoder. But now we've set the SIP Trunk to SIP Notify<br>
> (out-band) which should work with the IP Phones OOB, but all I get is<br>> '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>
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