ETSI TS 102 232-4-2017
合法偵聽(LI);切換接口和用于IP傳輸的具體服務細節(SSD);第4部分:第2層服務的具體服務細節(V3.3.1;包括軟盤)
Lawful Interception (LI); Handover Interface and Service-Specific Details (SSD) for IP delivery; Part 4: Service-specific details for Layer 2 services (V3.4.1; Includes Diskette)