[asterisk-users] ${ANSWEREDTIME} Broken on 1.2.13?

[Barton Fisher]

No matter what I do, ${ANSWEREDTIME} is always 0, even on the most 
simplest dial plan such as:
Using  Asterisk 1.2.13

exten => 77,1,Answer
exten => 77,2,Playback(custom/dax/S300) ; one minute file
exten => 77,3,Noop(${ANSWEREDTIME})
exten => 77,4,Hangup

    -- Executing Answer("SIP/5402-b7b45f58", "") in new stack
    -- Executing Playback("SIP/5402-b7b45f58", "custom/dax/S300") in new 
stack
    -- Playing 'custom/dax/S300' (language 'en')
    -- Executing NoOp("SIP/5402-b7b45f58", "") in new stack
    -- Executing Hangup("SIP/5402-b7b45f58", "") in new stack

What gives on this simple thing?

Bart