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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A">Something in between is manipulating the addressing in the SIP message. You said that ALG was disabled in the router, but either that is incorrect or there
is some other piece of equipment changing the message.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A">This is clear because the contact is not the only header that is changed. The ‘received’ parameter of the Via address was also changed from the public address
of the UA to the private address. Only an entity within the private network could know that address, so it is almost certainly the router doing it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A">Ben Newlin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> users-bounces@lists.opensips.org [mailto:users-bounces@lists.opensips.org]
<b>On Behalf Of </b>Satish Patel<br>
<b>Sent:</b> Thursday, April 09, 2015 10:13 AM<br>
<b>To:</b> OpenSIPS users mailling list<br>
<b>Subject:</b> Re: [OpenSIPS-Users] URGENT: contact header changed between opensips and client<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Any thought guys? Why contact address change in transit? is it normal?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Apr 8, 2015 at 12:12 PM, Satish Patel <<a href="mailto:satish.txt@gmail.com" target="_blank">satish.txt@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Very interesting thing going on between opensips and my client [UA]<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Opensips sending following contact header to Client but on client side i check it received different contact header, who is changing it?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">[UA]-----[Opensips]------[FS]<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">UA - 173.xx.xx.xx.215<o:p></o:p></p>
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<p class="MsoNormal">Opensips - 182.xx.xx.164:5060<o:p></o:p></p>
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<p class="MsoNormal">FS - 182.xx.xx.162:5061<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">My UA behind the NAT and I have ALG disabled on router. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">* [Opensips] sending following packet SDP OK 200 to [UA]<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">2015/04/08 07:42:22.820354 182.xx.xx.164:5060 -> 173.xx.xx.215:49152<br>
SIP/2.0 200 OK<br>
Via: SIP/2.0/UDP 173.xx.xx.215:49152;received=173.xx.xx.215;rport=49152;branch=z9hG4bKPjHB6245E6-SpIsEUs.kPIxxNAFMM0HTDo<br>
Record-Route: <<a href="sip:182.xx.xx.164;lr;ftag=OdSDiepaL9YssVLqOv.3C82QrrsrrdUV;did=3fd.556edf93">sip:182.xx.xx.164;lr;ftag=OdSDiepaL9YssVLqOv.3C82QrrsrrdUV;did=3fd.556edf93</a>><br>
CSeq: 722 INVITE<br>
Contact: <<a href="sip:1646327XXXX@182.xx.xx.162:5061;transport=udp">sip:1646327XXXX@182.xx.xx.162:5061;transport=udp</a>></span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">* [UA] Received following packet, look at Contact: it changed here. 162 to 164. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">U 182.xx.xx.164:5060 -> </span><a href="http://192.168.1.9:60895/" target="_blank"><span style="font-size:9.5pt">192.168.1.9:60895</span></a><span style="font-size:9.5pt"><br>
IP/2.0 200 OK.<br>
Via: SIP/2.0/UDP 173.xx.xx.215:49152;received=192.168.1.9;rport=49152;branch=z9hG4bKPjHB6245E6-SpIsEUs.kPIxxNAFMM0HTDo.<br>
Record-Route: <<a href="sip:182.xx.xx.164:5060;lr;ftag=OdSDiepaL9YssVLqOv.3C82QrrsrrdUV;did=3fd.556edf93">sip:182.xx.xx.164:5060;lr;ftag=OdSDiepaL9YssVLqOv.3C82QrrsrrdUV;did=3fd.556edf93</a>>.<br>
CSeq: 722 INVITE.<br>
Contact: <<a href="sip:1646327XXXX@182.xx.xx.164:5061;transport=udp">sip:1646327XXXX@182.xx.xx.164:5061;transport=udp</a>>.</span><o:p></o:p></p>
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