transfer_on_fail
Created by Ryan Harris, last modified on 2018.02.07
transfer_on_fail
string Allows you to transfer call flow when a called party can not be reached for specific reasons (unallocated_number, etc).
you must also set failure_causes
Argument syntax: hangupcauses destination dialplan context
Usage
<action application="set" data="failure_causes=UNALLOCATED_NUMBER"/>
<action application="set" data="transfer_on_fail=UNALLOCATED_NUMBER"/>
<action application="set" data="transfer_on_fail=1"/>