HLR and VLR defination and function for GSM and LTE in telecom

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GSM ARCHITECTURE

What is SMSC? - How SMSC number is used?

HLR

GSM - Architecture

LTE Network Architecture

How Incoming Calls To a Mobile Phone are Handled in GSM

Base Station Subsystem - an overview

What is a mobile core network? – Commsbrief

LTE EPC is the Core Network of LTE networks.