<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<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:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.E-MailFormatvorlage17
{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:70.85pt 70.85pt 2.0cm 70.85pt;}
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]-->
</head>
<body lang="DE" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am trying to register with a Deutsche Telekom SIP Trunk.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The Deutsche Telekom technical documentation states that the client must set the following SIP header fields:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For an initial REGISTER without Authentication Challenge the SIP Header fields
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Security-Client: sdes-srtp;mediasec <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Proxy Request: mediasec <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Requirement: mediasec <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">shall be included. The platform replies with SIP 401 Unauthorised and contains the SIP header fields
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Security server: msrp-tls;mediasec <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Security server: sdes-srtp;mediasec <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Security server: dtls-srtp;mediasec <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">with indication of the possible encryption methods. For the following REGISTER with Authentication Challenge,
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">in addition to the originally included SIP header fields Security-Client, Proxy-Require, Require the SIP header fields
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Security Check: msrp-tls;mediasec <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Security check: sdes-srtp;mediasec <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- Security check: dtls-srtp;mediasec <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">shall also be included. According to RFC3261, the Security-Verify header fields can also be combined as a single header field.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have seen, that the Sofia-Stack has implemented these Fields.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">But I have not found a way to set these header fields in the REGISTER message.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">(For the INVITE messages I’m using the set action sip_h_*; not sure if this is correct.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">There I have the Problem, that I’m not able to set the SDP Attribute<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">a=3ge2ae:requested)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards, Johannes<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
</body>
</html>