The SMSC is mostly integrated with the IW/GMSC, that is, it has the functions of IW/GMSC to connect the SC with PLMN. Here, the GMSC receives short messages from the SMSC, requests routing information from the HLR, and forwards the short messages to the VMSC/SGSN of the mobile stations, while IWMSC receives short messages from PLMN and sends them to the receiving SMSC.

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