Does this not do the trick? <a href="http://wiki.freeswitch.org/wiki/Custom_Ring_Back_Tones">http://wiki.freeswitch.org/wiki/Custom_Ring_Back_Tones</a><div><br></div><div>Plays ringing tones (implying early media) if the remote channel is confirmed ringing and does not have early media. Unless I&#39;m reading that wrong.<br>
<br><div class="gmail_quote">On 10 October 2012 12:29, Mick Stevens <span dir="ltr">&lt;<a href="mailto:mickstevens@yahoo.com" target="_blank">mickstevens@yahoo.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:12pt;font-family:arial,helvetica,sans-serif"><div><span>Hi Michael &amp; Co,</span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">
<span><br></span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><span>Now with traces attached...</span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">
<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><span>The customer is 86.166.113.42, FreeSWITCH is 85.133.61.23x &amp; the Carrier is 125.236.36.3</span></div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><span><br></span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">
<span>Basically the carrier sends us a 180 without SDP (FreeSWITCH-Carrier Trace.pcap, packet 3...) which we transit back to the customer (Customer-FreeSWITCH Trace.pcap, packet 7).</span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">
<span><br></span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><span>Is there a away we can modify our response upon receipt of the 180 without SDP to send a 180/183 with SDP?</span></div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><span><br></span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">
P.S. I made a couple of quick test calls to replicate this &amp; I think I may have sent the customer leg of one &amp; the carrier leg of the other (duh, sorry, only noticed this when I merged the traces together &amp; the packets appears out of sequence). But the nos &amp; principles involved are the same, hence the two files...</div>
<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">
Any help much appreciated.</div><div><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">Rgds, Mick</div><div><div class="h5"><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">
<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"> </div><div style="font-family:arial,helvetica,sans-serif;font-size:12pt"><div style="font-family:&#39;times new roman&#39;,&#39;new york&#39;,times,serif;font-size:12pt">
<div><div><div style="font-size:12pt;font-family:arial,helvetica,sans-serif">  <div style="font-family:arial,helvetica,sans-serif;font-size:12pt"> <div style="font-family:&#39;times new roman&#39;,&#39;new york&#39;,times,serif;font-size:12pt">
 <div dir="ltr"> <font face="Arial"> <hr size="1">  <b><span style="font-weight:bold">From:</span></b> Michael Collins &lt;<a href="mailto:msc@freeswitch.org" target="_blank">msc@freeswitch.org</a>&gt;<br> <b><span style="font-weight:bold">To:</span></b> FreeSWITCH Users Help &lt;<a href="mailto:freeswitch-users@lists.freeswitch.org" target="_blank">freeswitch-users@lists.freeswitch.org</a>&gt; <br>
 <b><span style="font-weight:bold">Sent:</span></b> Monday, 8 October 2012, 21:32<br> <b><span style="font-weight:bold">Subject:</span></b> Re: [Freeswitch-users] Generate 180/183 with SDP upon receipt of a 180 without SDP<br>
 </font> </div> <br><div>Hi Mick,<br><br>What is the call flow in this case? I&#39;m curious to know what call legs exist and where the 180/183 is and is not
 happening. FreeSWITCH generally does all this for you, so I suspect there&#39;s a gremlin in the works. Can you pastebin a console debug log w/ SIP trace? That may give the gang here just enough information to figure out what&#39;s going on.<br>

<br>Thanks,<br>MC<br><br><div>On Mon, Oct 8, 2012 at 2:26 AM, Mick Stevens <span dir="ltr">&lt;<a rel="nofollow" href="mailto:mickstevens@yahoo.com" target="_blank">mickstevens@yahoo.com</a>&gt;</span> wrote:<br><blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div><div style="font-size:12pt;font-family:arial,helvetica,sans-serif"><div>Hi Folks,</div><div><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">

Does anybody know a way I can get FreeSWITCH to generate a 180 or 183 with SDP upon receipt of a 180 without SDP?</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">

<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">Unless I&#39;m being stupid (quite possible) I couldn&#39;t find an answer to this on the wiki, although lots around early media (I don&#39;t really want to resort to generating ringing for every call, in case the callee is genuinely engaged/busy for
 example).</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">

The context behind my enquiry is that I send traffic to another SIP carrier that then hands the traffic off at ISUP. Where the ISUP carrier sends back an ACM with a backward call indicator of &quot;subscriber free&quot; the carrier sends a 180 without SDP to me/FreeSWITCH assuming that any ringback tones will be generated by the SIP user agent (RFC 3398 blah, blah, blah).</div>

<div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:arial,helvetica,sans-serif">

Any help much appreciated!</div><div> </div><div><font face="arial, helvetica, sans-serif">Rgds, Mick</font></div><div><font face="arial, helvetica, sans-serif">Tel/SMS. <a rel="nofollow">+44(0)7967 594432</a><span style="font-weight:bold"><br>

</span>Fax. <a rel="nofollow">+44(0)7053 452429</a></font><font><span style="font-size:18px;color:rgb(0,51,102);font-weight:bold"></span><br></font></div><div><font face="arial, helvetica, sans-serif">Email/IM. </font><font><a rel="nofollow"><font face="arial, helvetica, sans-serif">mickstevens@yahoo.com</font></a><br>

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