<html>
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 10 (filtered)">
<style>
<!--
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
span.EmailStyle17
{font-family:Arial;
color:windowtext;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
-->
</style>
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi Everyone,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am really stuck here. I really need help!</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I receive the following ACK request in SER from a Linksys/PAP
user agent</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>that SER should forward to the destination User Agent: 2010000002.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ACK </span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2010000002@10.1.10.65:5060
SIP/2.0</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5fb5b16;rport</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>From: 2224440133 <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@host.domain.com>;tag=692c5bafde7b5655o0</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224449999@host.domain.com>;tag=3b968d2d</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Call-ID: c813c237-8673e16d@172.16.15.51</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>CSeq: 101
ACK
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Max-Forwards: 70
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Route: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr>,
<</span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>sip</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Contact: 2224440133 <</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>sip</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@172.16.15.51:5060></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>User-Agent: Linksys/PAP2-3.1.5(LS)</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Content-Length: 0 </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>But SER’s loose_route incorrectly modifies this ACK as
follows:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ACK </span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr
SIP/2.0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Record-Route: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr=on>
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 10.1.10.65;branch=0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5fb5b16;rport=5060
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>From: 2224440133 <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@host.domain.com>;tag=692c5bafde7b5655o0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224449999@host.domain.com>;tag=3b968d2d
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Call-ID: c813c237-8673e16d@172.16.15.51
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>CSeq: 101
ACK
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Max-Forwards: 16</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Route:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Contact: 2224440133 <</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>sip</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@172.16.15.51:5060></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>User-Agent: Linksys/PAP2-3.1.5(LS)</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Content-Length: 0</span></font></p>
<p class=MsoNormal></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Which causes the ACK to keep looping through SER:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ACK </span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr
SIP/2.0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Record-Route: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr=on>
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Record-Route: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr=on>
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 10.1.10.65;branch=0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 10.1.10.65;branch=0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5fb5b16;rport=5060
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>From: 2224440133 <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@host.domain.com>;tag=692c5bafde7b5655o0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224449999@host.domain.com>;tag=3b968d2d
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Call-ID: c813c237-8673e16d@172.16.15.51
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>CSeq: 101
ACK
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Max-Forwards: 15
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Route:
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Contact: 2224440133 <</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>sip</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@172.16.15.51:5060>
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>User-Agent: Linksys/PAP2-3.1.5(LS)
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Content-Length: 0</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ACK </span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr
SIP/2.0</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Record-Route: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr=on></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Record-Route: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr=on>
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Record-Route: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:10.1.10.65;ftag=692c5bafde7b5655o0;lr=on>
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 10.1.10.65;branch=0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 10.1.10.65;branch=0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 10.1.10.65;branch=0
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5fb5b16;rport=5060</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>From: 2224440133 <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@host.domain.com>;tag=692c5bafde7b5655o0</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To: <</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sip</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224449999@host.domain.com>;tag=3b968d2d
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Call-ID: c813c237-8673e16d@172.16.15.51
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>CSeq: 101
ACK
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Max-Forwards: 14
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Route:
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Contact: 2224440133 <</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>sip</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>:2224440133@172.16.15.51:5060>
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>User-Agent: Linksys/PAP2-3.1.5(LS)
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Content-Length: 0 </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am really stuck.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Can anyone tell me what is happening?!</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ramin</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
</body>
</html>