[Users] How to xlog failure status in failure_route?

I tried xlog $rs $rr to log the reason for a failure in failure_route but it just logs NULL. What am I doing wrong? The error status is available to test with t_check_status and is logged by ACC but not xlog. # Error from media gateway failure_route[4] { xlog("L_INFO","failure_route[4] $si: method $rm r-uri <$ru>\n"); if (t_check_status("(5..)|(6..)|(403)")) { # gateway failure/refusal xlog("L_INFO","failure_route[4] gateway returned 5xx or 6xx. Status: $rs $rr\n"); if (!next_gw()) { xlog("L_CRIT","No more gateways for <$tu>\n"); t_reply("503", "Service not available - No more gateways"); return; } else { xlog("L_INFO","failure_route[4] next gw r-uri <$ru> \n"); t_on_failure("4"); t_relay(); return; } } xlog("L_INFO","failure_route[4]: relaying normal error\n"); t_relay(); } Oct 26 18:02:04 jello /usr/sbin/openser[2028]: ACC: call missed: method=INVITE, i-uri=sip:9319174147124@siptest.columbia.edu;user=phone, o-uri=sip:19174147124@67.151.91.22:50 60;transport=udp, call_id=c141e612-75cfa484-cfce783b(a)128.59.37.218, from="Alan Crosswell" <sip:10508@siptest.columbia.edu>;tag=CA5BDB76-6DB44EED, code=403 Forbidden Oct 26 18:02:04 jello /usr/sbin/openser[2028]: failure_route[4] 128.59.37.218: method INVITE r-uri <sip:19174147124@67.151.91.22:5060;transport=udp> Oct 26 18:02:04 jello /usr/sbin/openser[2028]: failure_route[4] gateway returned 5xx or 6xx. Status: <null> <null> Oct 26 18:02:04 jello /usr/sbin/openser[2028]: failure_route[4] next gw r-uri <sip:19174147124@67.151.91.22:5060;transport=udp>