MT stands for the Message Termination in which the message will be terminated from the application via interfaces like ( HTTPP/SMPP/WEB ) to gateway vendors and received over mobile phone.
However, MO stands for Message origination .The term MO message stands for “mobile originated” messaging. This type of message refers to a message sent from a mobile phone. More precisely, this is a message that customer/subscriber sends from mobile phone to mobile marketing and mobile SMS provider through the SMS platform. This MO hits can be captured over application as Inbox hits ( also known as two way messaging OR ShortCode/LongCode service )