Using the Manager interface, I issue an Originate command. It indeed dials, and is handled in the dialpan, but the DIALSTATUS value is empty (I have tried answered and unanswered calls).
I am using Trixbox 2.6.18-53.1.4.el5 (SMP)
Any idea why this is so? (How can I determine how the call went?)

exten => s,1,NoOp(HANGUPCAUSE is ${HANGUPCAUSE})
exten => s,2,NoOp(DIALSTATUS is ${DIALSTATUS})
exten => s,3,Goto(s-${DIALSTATUS},1)