SMS over GSM:

  1. For the transmission of SMSs in GSM, a special server called SMS Center (SMSC or SC) has to be implemented
  2. Although the SC does not belong to the GSM network, physically it can be integrated in the same machine as the MSC
  3. The MSC is in charge of switching functions for all the calls in a certain geographical area.
  4. The SMS Gateway MSC (SMS-GMSC) is responsible for forwarding the SMS to the destination Visiting MSC (VMSC) and returning the appropriate error information if it’s the case
  5. In order to reach the SC, the PLMN has to send the message from the VMSC to the MSC where the SC is situated through an entity called SMS-Interworking MSC (SMSIWMSC). It can receive the message from the PLMN and send it to the recipient SC.

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