Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR); Gs interface layer 3 specification
7.5.0
7.4.0
7.3.0
7.2.0
7.1.0
6.7.0
6.6.0
6.5.0
6.4.0
6.3.0
6.2.0
6.1.0