Barge in the given call, i.e., join some channel to an active call without invitation.
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Three way is implemented using eavesdrop and therefore DTMF signals sent by the third party will have the same affect.
<action application="three_way" data="<any uuid of a bridged call>"/>
Or with mod_event_socket:
SendMsg <barge-in initiator uuid>
execute-app-arg: <any uuid of a bridged call>