It provides a facility for users to send SMS between mobile phones or applications. There are three main parts of this process mainly called as Mobile Originated (MO) messages, SMSC and Mobile terminated (MT) messages.
In MO messages what it does is sending message from the mobile phone to SMSC. This will have to follow through many steps such as Base station system (BSS) and Mobile Switching Center (MSC). Visitor Location Register (VLR) and Home Location Register (HLR) will als updated and verifies on the way.
In SMSC as for the definition it routes message and regulate the process.. It applies relevant logics, filtering, validations for the message and follow the necessary procedure. Target of the message could be a another mobile phone or a particular application.
In MT messages again there is a defined path to be followed. First senders location should be found by accessing HLR which contains all the detail of the subscribers. Then once the location of the user is found, it is sent to MSC and there it access VLR for further user detail verification and authentication. Then form MSC it sends the message to the particular mobile subscriber.
If the message is not delivered, HLR is informed to update SMSC when the particular subscriber come live. Message will be stored at MSC. There are two concepts in that case too. Store & Forward and Forward & Store.
In Store and forward message will be stored before checking whether the user is online or not. In the other method forward and store, message is stored once the messaged delivery is failed. There are advantages and disadvantages of both these models.
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