GSM call flow for MS to SMS

Explain briefly the GSM call flow for MS to SMS? And also GSM call flow from MS to the roaming MS?

E

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At first, SMS is submitted to the SMSC then it is forwarded from there to the SMS gateway. SMS Gateway retrieves Routing info from HLR and sends it to the MSC. MSC gets present place from VLR of recipient mobile and delivers the message.

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