This object specifies how the media is to be setup on
an IP-IP Gateway. Two choices are valid: flow-through
and flow-around. When in flow-through mode, which is the
default setting, the IP-IP Gateway will terminate and
then re-originate the media stream. When flow-around
is configured the Gateway will not be involved with the
media, since it will flow-around the Gateway and will
be established directly between the endpoints.