<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">In the text below I quote Kerker 'SER does support DNS failover.'.<DIV>Is this ser or openser? Where can I read more about this?</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>-g</DIV><DIV><BR><DIV><DIV>On Jan 15, 2007, at 10:40 AM, Klaus Darilion wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><BLOCKQUOTE type="cite"><BLOCKQUOTE type="cite"><BLOCKQUOTE type="cite"><P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>Staffan,</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px; font: 12.0px Courier New; min-height: 14.0px"><I></I><BR></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>Kerker Staffan wrote:</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>...</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px; min-height: 14.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I><SPAN class="Apple-converted-space"> </SPAN></I></FONT></P> <BLOCKQUOTE type="cite"><P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>Now, if I disable one of the Gateways, I hang every second call. OpenSER does</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>not</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>try the second A record address if the first doesn't answer. How can I solve</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>this? Shouldn't OpenSER fail over to the second A record listed in the NAPTR</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>=> SRV</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>resolving? Or will OpenSER continue to resend all SIP INVITES until timers</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>fire? Would</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>it help if the proxy recieved an ICMP port/destination unreachable from the</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>network? Is</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>there anyway to get around this? In the other direction, from POTS to sip,</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>the PGW2200</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>nicely switches over to the second of my two OpenSER servers if I shut one of</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>them down. These servers have the same DNS entries (but for another SIP domain, NAPTR =></I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>SRV => 2x A record).</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 40.0px; min-height: 14.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I><SPAN class="Apple-converted-space"> </SPAN></I></FONT></P> </BLOCKQUOTE><P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>Yes, OpenSER or for that matter every transaction stateful proxy should</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>do RFC 3263 based fail-over. But as you can imagine this is pretty</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>complex to implement and that's why openser does not support it yet, it</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>is listed on the development roadmap. The newest release of SER does</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px"><FONT face="Courier New" size="3" style="font: 12.0px Courier New"><I>support DNS failover.</I></FONT></P> <P style="margin: 0.0px 0.0px 0.0px 30.0px; font: 12.0px Courier New; min-height: 14.0px"><I></I><BR></P> </BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>