asterisk users - Feb 2007 - Can't get ANSWEREDTIME after hangup using ZAP

Dear all,

I tried to make a call with PHP AGI.

$rc = execute_agi("EXEC DIAL ZAP/g1/$myphonenumber|60|rhHL(" .
($max_total_seconds * 1000) . ":60000:30000) ");
$rc = execute_agi("GET VARIABLE ANSWEREDTIME ");

And I can't get the answered time after caller hangup in this method.

But if I use a SIP channel as below:
$rc = execute_agi("EXEC DIAL SIP/$mysiptrunk/$myphonenumber|60|rhHL("
. ($max_total_seconds * 1000) . ":60000:30000) ");
$rc = execute_agi("GET VARIABLE ANSWEREDTIME ");

I can get the correct answered time.

Is any idea about it?

Is it the problem of my ZAP channel's configuration?

-- 

Best Regards
Charles