Network & Switching Sub-Systems (NSS)

Manages communication between the mobile user with the other users. Consists of different components as:

• Mobile Switching Centre (MSC)
• Gateway Mobile Switching Centre (GMSC)
• Home Location Register (HLR) 
• Visitor Location Register (VLR)
• Authentication Centre (AuC) 
• Equipment Identity Register (EIR)

Mobile Switching Centre (MSC) is the heart of the mobile GSM network. Performs call routing, call set-up and basic switching functions. Generates CDR for each & every call. Communicates with HLR, VLR & other MSCs.

Gateway Mobile Switching Centre (GMSC) functions as a gateway between 2 networks. Switch to the Public Switch Telephone Network (PSTN).

HLR contains a data base for subcriber specific information such as IMSI, current location of the MS, roaming restrictions etc.

VLR contains a temporary database about all active subcribers and always integrated with the MSC. 

EIR is a database that keeps tracks of handsets on the Network using the IMEI number.

AuC handles the authentication and encryption task for the Network. It is mainly used for security reasons.

BEST provides turnkey design and build solutions for all Telecom Switching Centres.