Created by Ryan Harris, last modified on 2018.02.07
dtmf digit Used with attended transfer function. Allows you to set a DTMF key that will cancel the att_xfer and re-connect to the call on hold. It'll also cancel a bridge that hasn't been bridged as yet (and thus can't be terminated with a bridge_terminate_key). Implemented in revision 14650.
<action application="set" data="origination_cancel_key=#"/>