Variable disable q850 reason
From FreeSWITCH Wiki
When set to true, this disables sending of the Reason header, which includes the Q.850 reason code, in responses and BYEs. For a list of hangup causes and their Q.850 codes, see Hangup Causes. This is available as of revision 15850 committed 12/8/2009.
<action application="set" data="disable_q850_reason=true"/>