This is a read-write enumerated setting choosing whether an IP-IP Gateway operates in flow-through mode, where it terminates and re-originates the media stream and which is the default, or flow-around mode, where the media bypasses the gateway entirely and flows directly between the two endpoints. An admin selects flow-around to offload media-handling work from the gateway when it isn't needed, at the cost of losing whatever mid-stream processing flow-through would have provided. For example, an admin optimizing a heavily-loaded IP-IP gateway might switch selected peers to flow-around so the gateway only handles call signaling, not the actual voice media, for those calls.