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External ShortMessaging Entity
Short MessagingService Center
8
Home LocationRegister
Mobile SwitchingCenter
9
Public SwitchedTelephone Network
Visitor LocationRegister
10
Base Station
11
Paging Channel
SMS Delivery / Voice Call Establishment
Random AccessChannel
SMS Delivery / Voice Call Establishment
12
Standalone DedicatedControl Channel
SMS Delivery / Voice Call Establishment