Mobile Originated (MO)
Mobile Originated (MO) messaging refers to a voice call or SMS message that originates from a mobile phone. More precisely in the case of SMS, this is an SMS text message that the customer/subscriber sends from their mobile device to another mobile user or application. The term also describes the communications leg between the customer/subscriber and the SMSC.
See Melrose Labs Tyr SMS Gateway
Melrose Labs: Our mission is to deliver pivotal services in cloud communications across mobile, fixed-line and internet for enterprises of all sizes. These services allow organisations to improve their effectiveness, increase revenues and reduce costs when they use our cutting-edge communication services in business operations, and with customers and staff.