Cisco ASR 5000 series Product Overview page 665

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Serving GPRS Support Node (SGSN) 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

Network Deployments and Interfaces ▀

Cisco ASR 5000 Series Product Overview ▄