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The Network Switching System has at it's core the Mobile Switching Centre (MSC). This takes the communication from the BSS and dependent on the destination, will switch to another part of it's home network for an intra network call; to another mobile network for a inter mobile call or to the PSTN.
To support the role of the NSS in 2G networks there are 4 key sub-systems there as part of the Operational Support
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