Serving GPRS Support Node (SGSN) Overview
Network Deployments and Interfaces ▀
Cisco ASR 5000 Series Product Overview ▄
Gs: This is the interface used by the SGSN to communicate with the visitor location register (VLR) or mobile
switching center (MSC) to support circuit switching (CS) paging initiated by the MSC. This interface uses
Signaling Connection Control Part (SCCP) connectionless service and BSSAP+ application protocols.
Gf: Interface is used by the SGSN to communicate with the equipment identity register (EIR) which keeps a
listing of UE (specifically mobile phones) being monitored. The SGSN‘s Gf interface implementation supports
functions such as:
International Mobile Equipment Identifier-Software Version (IMEI-SV) retrieval
IMEI-SV status confirmation
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