Mobile Originated (MO) is when the connection is established
from the mobile subscriber. Everything that originates from the mobile station
is referred to as mobileoriginated. It does not matter whether the connection is switched to a mobile terminal or a terminal in the fixed network
. The originating point of the connection is what matters. This also applies to short message service. SMS sent from a mobile phone are referred to as Mobile Originated SMS (SMS-MO). If a connection is switched to a mobile device, it is referred to as Mobile Terminated (MT).