ETSI EN 301 004-2:1999 宽带综合业务数字网(B-ISDN);七号信令系统; Messages Transfer Part(MTP)Level 3功能和支持国际互连的消息;第2部分:协议实施一致性声明(PICS)Proforma Spe
Broadband Integrated Services Digital Network (B-ISDN); Signalling System No.7; Messages Transfer Part (MTP) Level 3 Functions and Messages to Support International Interconnection; Part 2: Protocol Implementation Conformance Statement (PICS) Proforma Spe