<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif;"><div>as i understand it, these very specific definitions, for example Answer Seizes Ratio ASR] in SIP terms i.e. Session Establishment Ratio & were produced by the IETF to standardize on measuring performance between carriers . I was wondering if anyone was using them internally and also with any of your interconnect partners?</div><div><br></div><div> Another example would be Session Defects Ratio (SDR) is the percentage of call attempts receiving the following responses, in relation to total call attempts or INVITES:</div><div>o 500 Server Internal Error</div><div>o 503 Service Unavailable</div><div>o 504 Server Timeout</div><div><br></div><div> Or do you just measure 503’s?</div><div><br></div><div><br></div><div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri">Thanks ,</font></font></div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><br></font></font></div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri">Richard Jobson</font></font></div><div><table id="social" style="font-family: sans-serif;"><tbody><tr><td style="text-align: right;">E-mail:</td><td><a href="mailto:richard@teraquant.com">richard@teraquant.com</a></td></tr><tr><td style="text-align: right;">Web:</td><td><a href="http://www.teraquant.com">www.teraquant.com</a></td></tr></tbody></table></div><div><br></div></div></body></html>