Using the SMSC (Short Message Service Center) of the operator, they send
out messages. Take a look at the following figure; it explains how a message is sent
from our website to the mobile device.
SMSC (Short Message Service Center) and MSC (Mobile Switching Center) are the
most important parts of the process. SMSC is a store and forward agent; it stores the
messages to be sent and tries to deliver them via an appropriate switching center.
Consider that the job of an MSC is very much like that of a network switch??”routing
information as necessary. The SMS Service Center now checks with the Home
Location Register (HLR) and Visitor Location Register (VLR) to see where the mobile
device is. If you are roaming outside your home location, you will be registered in
the Visitor Location Register in that particular location. When you come back to the
home location, you will be registered in the Home Location Register. The registers
essentially keep a track of your presence! Once it is confirmed where the device is
and that it is available, the message is sent to the MSC, and MSC delivers it to the
mobile through the Base Station Controller (BSC) and Base Transceiver Station (BTS).
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