[SR-Users] Trouble getting start time / call duration from dialog module

Hi All I am in need of being able to see what the duration of the call was at the time of hang out. I tried turning on the dialog module, but the result is that the values I need are either null or always show as zero. I tried to follow the suggestions in the thread about this here: http://lists.sip-router.org/pipermail/sr-users/2010-October/065889.html In the end my config looks like this: loadmodule "dialog.so" ... modparam("dialog", "dlg_flag", 4) modparam("dialog", "dlg_match_mode", 1) ... request_route { if (is_method("INVITE") && (! has_totag() ) ) { dlg_manage(); } if (is_method("BYE")) { $var(elapsed) = ( $TV(s) - $dlg(start_ts) ); xlog ("L_INFO", "request_route DIALOG TEST: Completed $dlg(from_uri) to $dlg(to_uri), elapsed: $var(elapsed), now seconds: $TV(s), dlg start time: $dlg(start_ts), DLG_lifetime: $DLG_lifetime"); } .... Note that I put at the top of the request route just for testing purposes The result I get in the log is this: INFO: <script>: request_route DIALOG TEST: Completed sip:willf1976Test@develop-sbc.switchsoft.com to sip:+18054515526@develop-sbc.switchsoft.com, elapsed: 1421305210, now seconds: 1421305210, dlg start time: 0, DLG_lifetime: <null> I was wondering if any one could point out to me what I have set up wrong. Thanks in advance All the best. Will Ferrer Switchsoft