SMS Terminology

• SMS - Short Message Service i.e. text messages
• SMSC - Short Message Service Centre The system responsible for storing and forwarding messages
• MO - Mobile Originated A message on its way from a mobile or landline device to the SMSC
• MT - Mobile Terminated A message on its way from the SMSC to the mobile or landline device
• RX - Receive A message coming in to the Asterisk box
• TX - Transmit A message going out of the Asterisk box