most recent 30 from http://mrwatsoncomehere.com 2010-07-30T02:44:08Z http://mrwatsoncomehere.com/feeds/tag/ansi-tcap http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mrwatsoncomehere.com/questions/7/what-does-a-connfail-correlate-to Damian Glenny 2009-10-12T21:56:09Z 2009-10-12T21:56:09Z

<p>Looking specifically at an IS-826 deployment using ANSI TCAP, what should a CONNFAIL use as the invoke correlation?</p> <p>I believe that the message flow in a compliant environment will look like this, somewhat abstracted:</p> <ul> <li>ANLYZD tid anlyzd-tid cid anlyzd-cid</li> <li>CONNRES tid connres-tid-anlzyd-tid cid connres-cid-anlyzd-cid</li> <li>CCDIR tid ccdir-tid cid ccidr-cid</li> <li>ccdir_rr tid ccdir-tid cid ccdir-cid (try saying that three times fast)</li> <li>RESETTIMER tid connres-tid-anlzyd-tid cid connres-cid+1-anlyzd-cid</li> <li>...</li> <li>CONNFAIL tid anlyzd-tid-connres-tid cid anlyzd-cid+1-last-reset-timer-cid</li> <li>anlyzd_rr tid anlyzd-tid cid anlyzd-cid</li> </ul> <p>I think that this implies a CONNRES dialogue needs to remain available until either:</p> <ul> <li>a CONNFAIL is received on it</li> <li>a DISCONNRES is sent on it</li> <li>(optionally) CCDIR failure tears the call down</li> </ul> <p>This doesn't dovetail very well with the optionality of CCDIRs - how do you avoid potential call leaks without timers on an invoking dialogue? Do you rely on the MSC having a timer fire off the ANLYZD? Wouldn't the CONNRES force that to be elided?</p>