<html><head><base href="x-msg://19/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Aditya,<div><br></div><div>That all depends on the switch. Asterisk sends a 503 if you look at it the wrong way, that is, under many conditions. In my experience most carriers will send a 503 when their upstream paths are full (or your concurrent calls to them is full) and they expect you to route advance to another carrier. A 503 could cause a proxy or a switch to blacklist the host that sent it for a period, so proxies (Opensips included) will convert a 503 to a 500 before relaying.</div><div><br></div><div>When a switch has trouble processing the request because of some internal issue, say, a database error, it will reply with a 500.</div><div><br></div><div>This list is by no means all inclusive. Hopefully it will point you in the right direction.</div><div><br></div><div><br></div><div>- Jeff</div><div><br></div><div><br></div><div><div><div>On Jan 4, 2010, at 10:13 PM, Aditya Kumar wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Thanks Jeff for the link.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I did see 3261.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Question is : RFC will tel high level about response codes.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I am trying to understand in particular when a End User (UAS) will sent.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I am clear from a proxy perspective.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; ">Was looking some one can share your experiences when a UAS will send 5xx <br><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold; ">From:</span></b><span class="Apple-converted-space"> </span>Jeff Pyle <<a href="mailto:jpyle@fidelityvoice.com">jpyle@fidelityvoice.com</a>><br><b><span style="font-weight: bold; ">To:</span></b><span class="Apple-converted-space"> </span>OpenSIPS users mailling list <<a href="mailto:users@lists.opensips.org">users@lists.opensips.org</a>><br><b><span style="font-weight: bold; ">Sent:</span></b><span class="Apple-converted-space"> </span>Mon, January 4, 2010 7:01:34 PM<br><b><span style="font-weight: bold; ">Subject:</span></b><span class="Apple-converted-space"> </span>Re: [OpenSIPS-Users] 3rd party Client sending 5xx<br></font><br>Please see:<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><span> <a target="_blank" href="http://www.apps.ietf.org/rfc/rfc3261.html#sec-21.5">http://www.apps.ietf.org/rfc/rfc3261.html#sec-21.5</a></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">On Jan 4, 2010, at 9:53 PM, Aditya Kumar wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><div id="cg_msg_content" style="margin-top: 0px; margin-right: 10px; margin-bottom: 10px; margin-left: 10px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Hi all,</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I am inter working with a 3rd party SIP UA and I see they are sending 503/500. </div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Can any one tell me what are the cases at which a SIP UAS will sent 503 or 500 </div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "></div></div></div><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "></div></div></div></blockquote></div></div></div></div></div></div></span></blockquote></div><br></div></body></html>