<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=US-ASCII">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7651.11">
<TITLE>Locally generated single-hop ACKs with Route headers</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/rtf format -->
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Hello, </FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">I am using OpenSER v1.0.1</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">I am currently testing with proxies running OpenSER. </FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">I have a problem with ACK messages generated and routed for scenarios where an inititiated call session fails to establish between A and B parties e.g. Unsuccessful No Answer, Unsuccessful Busy. The ACK messages are single hop locally generated responses to the sip error message e.g. '487 Request Terminated', '486 Busy'.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">The behaviour I observe is that Route headers are 'remembered' from the initiating INVITE message and inserted into the ACK messages automatically generated by OpenSER. </FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">This extra Route header causes problems with routing and the generation unwanted messages (error message resends) in addition to expeceted scenario call-flow. It is also visible at the B-Party. </FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">I would like to either prevent the creation of, or remove this Route header. I have tried to remove this header using the OpenSER available methods, but this has failed. </FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">I have noticed that the known issue described in the document: SIP Express Router v0.8.8 - Developer's Guide under section: 9.6.4 Known Issues appears to describe this problem. </FONT></SPAN></P>
<P><SPAN LANG="en-us"> <FONT SIZE=2 FACE="Arial">"local ACK/CANCELs copy'n'pastes Route and ignores deleted Routes"</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Has this issue been resolved? If so, from what version of OpenSER? </FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">If it has not been resolved, is there a way to resolve or workaround this problem?</FONT></SPAN>
</P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Best regards,</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Andrew Augustin</FONT></SPAN><SPAN LANG="de"> </SPAN>
</P>
</BODY>
</HTML>