This TS specifies or references procedures used on the Serving GPRS Support Node (SGSN) to Visitors
Location Register (VLR) interface for interoperability between GSM circuit switched services and GSM packet data
This TS specifies the layer 3 messages and procedures on the Gs
interface to allow coordination between databases and to relay certain messages related to GSM circuit switched services over the GPRS subsystem.
The functional split between VLR and SGSN is defined in TS 23.060
. The required procedures between VLR
and SGSN are defined in detail in the present document.