<div dir="ltr">Hello List,<div><br></div><div>We have a several OpenSIPS running (1.11) and they have same priority in DNS SRV.</div><div>Also OpenSIPS replicate REGISTER to share user location information.</div><div><br></div><div>Yesterday we had a loop caused by some buggy UAC (Polycom 501) when the phone has sent CANCEL with URI containing domain name and which (apparently) was not recognized by tm as a part of any dialog.</div><div><br></div><div>So the proxy01 has resolved domain name with another OpenSIPS (proxy02) and relayed it to it. And proxy02 did the same and relayed it back to proxy01 and so on. This caused the loop which caused communication problems and we had to restart all OpenSIPS routers to fix it.</div><div><br></div><div>My question is if anyone had this kind of problems and what is the best practices to solve it.</div><div>We have in mind several ideas:</div><div>1 . Block any traffic from another OpenSIPS servers except REGISTER packets (to allow locations replication)</div><div>2. Looped packets has dozens of Via headers, and we can check if there too many via headers and drop packet. The max-forward header is decreasing but problem happens before all 70 forwards passed.</div><div>3. Migrate to OpenSIPS 2, use binary replication and block SIP traffic between OpenSIPS.</div><div>4. Add some delay before processing packets</div><div><br></div><div>Thank you in advance,<br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><span><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:15px;font-family:Arial;color:rgb(0,112,192);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Stas Kobzar</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:Arial;color:rgb(166,166,166);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Developeur VoIP / VoIP Developer</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><br></p></span><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,112,192);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Modulis.ca Inc.</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:Arial;color:rgb(0,0,0);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent"># Bureau / Office: 514-284-2020 x 246</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11px;font-family:Arial;color:rgb(0,0,0);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Email</span><span style="font-size:11px;font-family:Arial;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">: </span><span style="text-decoration:underline;font-size:11px;font-family:Arial;color:rgb(17,85,204);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><a href="http://firstname.lastname" style="text-decoration:none" target="_blank">s</a>tas.kobzar</span><a style="text-decoration:none"><span style="font-size:11px;font-family:Arial;color:rgb(17,85,204);text-decoration:underline;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">@modulis.ca</span></a></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"> </span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="text-decoration:underline;font-size:11px;font-family:Arial;color:rgb(17,85,204);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><a href="https://www.modulis.com/" style="text-decoration:none" target="_blank">https://www.modulis.com</a></span></p><div><br></div></div><div dir="ltr"><a href="https://www.modulis.com/es-url-001" style="font-family:'Times New Roman';font-size:medium" target="_blank"><img src="https://www.modulis.com/es-img-001"></a></div></div></div></div></div></div></div></div></div></div>
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