Integrated Services Digital Network (ISDN); Generic functional protocol for the support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification
综合业务数字网(ISDN);支持补充业务的通用功能协议;数字用户信令系统第一号(DSS1)协议;第2部分:协议实现一致性声明(PICS)形式规范