Voice Core Network (VCN)

VCN is configured with Mobile Switching Center(MSC), Home Location Register(HLR), and Interworking Function(IWF). VCN processes the voice and circuit data of MS, which has been received through AN.

Mobile Switching Center (MSC)

MSC performs switching in the CDMA2000 network. MSC connects mobile subscribers in the network with subscribers in another network, and authorizes MSs in the CDMA2000 1X network. Also, MSC inter-works with various supplementary system devices to provide mobile subscribers with additional services.

Home Location Register (HLR)

HLR is a database where information on CDMA2000 mobile communication

subscribers is archived. HLR can be fault tolerant seamlessly and process database in real-time. HLR inter-works with MSC, the SMS center, network administration center, and customer center.

Interworking Function (IWF)

IWF provides mobile subscribers with circuit data communication services such as facsimile and modem communications, and has a modem pool.

Once IWF receives a request for circuit data service from a mobile subscriber or Public Switched Telephone Network(PSTN), IWF allocates resources of the modem pool to provide services.