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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We are testing OpenSIPS for simple redirect call scenarios. We expect OpenSIPS to try all Contact headers in the SIP 3xx respectively based on q value. For the SIP 3xx with multiple Contact headers, our configuration works fine. But for the SIP 3xx with one Contact header, it does not work.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Configuration:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>failure_route[1] {<o:p></o:p></p><p class=MsoNormal> if (t_check_status("3[0-9][0-9]")) {<o:p></o:p></p><p class=MsoNormal> get_redirects("*");<o:p></o:p></p><p class=MsoNormal> serialize_branches(1);<o:p></o:p></p><p class=MsoNormal> next_branches();<o:p></o:p></p><p class=MsoNormal> t_relay();<o:p></o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal>}<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>From OpenSIPS source code, we know that<o:p></o:p></p><p class=MsoNormal>1. get_redirects puts the 1st Contact header URI into RURI, puts the 2nd Contact header URI into the 1st branch, etc.<o:p></o:p></p><p class=MsoNormal>2. serialize_branches sorts RURI and all branches, and puts them in a AVP.<o:p></o:p></p><p class=MsoNormal>3. next_branches extracts next hop from the AVP.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>When there are multiple Contact headers, all (get_redirects, serialize_branches and next_branch) work fine. When there is only one Contact header, get_redirects still works fine. But since there is not branch, serialize_branches does nothing especially does not set the AVP, then next_branches does nothing too since the AVP is empty.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The questions are, <o:p></o:p></p><p class=MsoNormal>1. Should serialize_branches still set the AVP when there is one Contact header?<o:p></o:p></p><p class=MsoNormal>2. According the comments for next_branches, in failure route, all Contact headers should be mapped to branches. Then, is the behavior of get_redirects, which can only be called in failure route block, correct?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If these are the designed behaviors, we can live on it. It is easy to write a working configuration.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'>Di-Shi Sun<o:p></o:p></p><p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'>VoIP Routing, Accounting, Security<o:p></o:p></p><p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><a href="http://www.transnexus.com/"><span style='color:blue'>www.TransNexus.com</span></a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>