<html><head><base href="x-msg://8/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Please see:<div> <a href="http://www.apps.ietf.org/rfc/rfc3261.html#sec-21.5">http://www.apps.ietf.org/rfc/rfc3261.html#sec-21.5</a></div><div><br></div><div><br></div><div><div><div>On Jan 4, 2010, at 9:53 PM, Aditya Kumar wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><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; "><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 <span class="yshortcuts" id="lw_1262659954_0" style="border-bottom-style: dashed; border-bottom-width: 1px; border-bottom-color: rgb(0, 102, 204); cursor: pointer; ">SIP</span> 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; position: fixed; "></div></div><br>_______________________________________________<br>Users mailing list<br><a href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a><br><a href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a><br></div></blockquote></div><br></div></body></html>