Question: What is the primary reference for Message Transfer Part (MTP) functions on E1 and T1 interfaces, respectively, for SGSN or VLR implementation in the Gs interface context?
Option 1: IETF RFCs for both E1 and T1 interfaces
Option 2: 3GPP specifications exclusively for both interface types
Option 3: ITU-T Recommendations for E1 and ANSI Recommendations for T1 interfaces
Option 4: IEEE Standards for both E1 and T1 network implementations
Explanation: In the context of telecommunications, specifically for the Gs interface in GPRS networks, MTP functions rely on established standards. For E1, ITU-T Recommendations provide foundational specs, while ANSI Recommendations guide T1 interfaces, ensuring compatibility and functionality across implementations.