mobile originated (mobile communications) (MO)

Mobile Originated(MO) is when the connection is established from the mobile subscriber.

Everything that originates from the mobile station is referred to as mobile originated. It does not matter whether the connection is switched to a mobile terminal or a terminal in the fixed network. The starting point of the connection is decisive.

This also applies to short messaging services. SMS sent from a cell 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).