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<div class=Section1>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;line-height:110%;font-family:Arial'>I have a problem with the Contact
header in a SIP SUBSCRIBE request.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;line-height:110%;font-family:Arial'>The situation is the following: FS
is setup as a presence client using TLS as the transport layer. The server is
to send presence information about a large number of mobile telephones.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;line-height:110%;font-family:Arial'>The FS sends a SUBSCRIBE to the
server, on a newly setup SSL connection. The SUBSCRIBE has in its Contact
address 5061 as the port to be used for NOTIFYs to be send by the server. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;line-height:110%;font-family:Arial'>I would like to use another port,
namely the port used by the server in the new setup connection. It that
possible and how? This would allow the server to respond on an established TLS
connection.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;line-height:110%;font-family:Arial'>I know there is another solution the
problem involving the setup of a new secure connection initiated by the server,
but I would prefer to change the port in our SUBSCRIBE request. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;line-height:110%;font-family:Arial'>I should mention that we do not use
registration towards the server.<o:p></o:p></span></font></p>
<p style='mso-margin-top-alt:4.5pt;margin-right:0cm;margin-bottom:2.25pt;
margin-left:0cm;line-height:12.0pt;background:white'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Thanks /Jon<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Souvenir Lt BT"><span style='font-size:
12.0pt;line-height:110%'><o:p> </o:p></span></font></p>
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