<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Hello,</p>
<p>just for the records, as I saw in the discussion thread that
there is a solution with a flag given to rtpengine, but can be
useful for similar situations -- better use
sdp_remove_line_by_prefix() from sdpops rather than subst regexp
-- see:</p>
<p> -
<a class="moz-txt-link-freetext" href="https://www.kamailio.org/docs/modules/devel/modules/sdpops.html#sdpops.f.remove_line_by_prefix">https://www.kamailio.org/docs/modules/devel/modules/sdpops.html#sdpops.f.remove_line_by_prefix</a></p>
<p>Cheers,<br>
Daniel<br>
</p>
<div class="moz-cite-prefix">On 06.12.18 13:17, Mark Hall wrote:<br>
</div>
<blockquote type="cite"
cite="mid:000001d48d5d$98a174e0$c9e45ea0$@brightvoip.co.uk">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using rtpengine to proxy audio to/from
media servers.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The outbound calls are being rejected by a
couple of my carriers (although accepted by others), and the
closest that I have been able to find for the reason is the
inclusion of “a=rtcp:xxxxx” in the SDP generated by rtpengine.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To test further, I am trying to remove this
line. Rtpengine itself doesn’t have any options to remove it,
so I am left with manipulating the generated SDP in Kamailio.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">A sample of generated SDP is:<o:p></o:p></p>
<p class="MsoNormal">a=maxptime:150<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:0 PCMU/8000<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:8 PCMA/8000<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:18 G729/8000<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:101 telephone-event/8000<o:p></o:p></p>
<p class="MsoNormal">a=fmtp:18 annexb=no<o:p></o:p></p>
<p class="MsoNormal">a=fmtp:101 0-16<o:p></o:p></p>
<p class="MsoNormal">a=sendrecv<o:p></o:p></p>
<p class="MsoNormal">a=rtcp:30939<o:p></o:p></p>
<p class="MsoNormal">s=My Media Server<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using <o:p></o:p></p>
<p class="MsoNormal">rtpengine_manage("RTP/AVP ICE=remove");<o:p></o:p></p>
<p class="MsoNormal">to generate the SDP to a variable
($avp(sdp))<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Now, I am trying to just remove the whole
a=rtcp line with re.subst<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$avp(sdp)=$(avp(sdp){re.subst,|a=rtcp:[0-9]*\R||s});
*** Tried / as delimiter also, but | looks cleaner ***<o:p></o:p></p>
<p class="MsoNormal">This should match the line and any CR/LF
characters – BUT in results, nothing is changed (various
online Regex testers show this match to be correct – I tried
\r\n also).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I do the same but without the \R, then
the line is removed but not the CR/LF, leaving a gap in the
SDP – which is invalid.<o:p></o:p></p>
<p class="MsoNormal">$avp(sdp)=$(avp(sdp){re.subst,|a=rtcp:[0-9]*||s});<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Gives:<o:p></o:p></p>
<p class="MsoNormal">a=maxptime:150<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:0 PCMU/8000<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:8 PCMA/8000<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:18 G729/8000<o:p></o:p></p>
<p class="MsoNormal">a=rtpmap:101 telephone-event/8000<o:p></o:p></p>
<p class="MsoNormal">a=fmtp:18 annexb=no<o:p></o:p></p>
<p class="MsoNormal">a=fmtp:101 0-16<o:p></o:p></p>
<p class="MsoNormal">a=sendrecv<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">s=My Media Server<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anyone see where I am going wrong, or
suggest an alternative?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Kind
Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Mark
Hall<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Kamailio (SER) - Users Mailing List
<a class="moz-txt-link-abbreviated" href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a>
<a class="moz-txt-link-freetext" href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio World Conference -- <a class="moz-txt-link-abbreviated" href="http://www.kamailioworld.com">www.kamailioworld.com</a>
Kamailio Advanced Training, Nov 12-14, 2018, in Berlin -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a></pre>
</body>
</html>