Answer Posted / malik muhammad mehran
there are different components of the MSC;
1) AUC (Authentication)
2) EIR (Equipment identity register)
3) VLR (Visiting location register)
4) HLR (Home location register)
5) IWF (Internetwork function)
6) EC (Echo canceller )
VLR and HLR are control data bases and EIR records the IMEIs which to allow and which to block and which is under any problem. AUC used for authentication of the users. Ec used to connect the PSTN with cellular network. IWF used for data rate adoption and protocol conversation.
Note that GMSC is not part of MSC but a type of MSC which used for translation between different networks of point of interconnection for the different networks...
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