<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:'times new roman', 'new york', times, serif;font-size:12pt"><div>Hi all,</div><div><br></div><div>I am inter working with a 3rd party SIP UA and I see they are sending 503/500. </div><div>Can any one tell me what are the cases at which a SIP UAS will sent 503 or 500 </div><div><br></div><div><br></div><div style="position:fixed"></div>
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