What is the meaning of MT and Mo in SMS development?

mo= Mobile Originate
mt= Mobile Terminate

Mt= downlink, that is, the SP end issued to the user information;
Mo= uplink, which is the information that the user sends to the SP.


Uplink: MO Submit SMS to SMS Center
Downlink: MT Message Center forwards text messages to specific users,
Your text message is like this, the message that you submit, the address that delivers is the message center. SMS Center received your message, store forwarding, forwarding will be based on your fill in the receiver number to find routes, issued.


In the field of MMS is the same truth.
Downlink Business: SP initiative initiated by the business, here mainly refers to the SP to MMSc business, because the MMS center is stored forwarding, so MMS Center again to send to the recipient.
Uplink business: SP passively receives the business, here mainly refers to receives the service from the MMSc, similarly, the MMS Center is stores forwards, therefore the MMS center will transmit the information to the SP.