asterisk users - Apr 2014 - SIP Q.850 Cause

Hello,

I'm trying to fetch outbound SIP PROGRESS Reason cause code in the
dialplan,
Asterisk 1.8.26.1 sip show settings:

Q.850 Reason header:    Yes
Store SIP_CAUSE:        Yes


However, i'm not getting any value in the dialplan variables, any
successful users of this feature?
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