33.040.30 交换和信令系统 标准查询与下载

22/30437454 DC BS IEC 62425 铁路应用 沟通;信号和处理系统 用于信号传输的安全相关电子系统

BS IEC 62425. Railway applications. Communication; signalling and processing systems. Safety related electronic systems for signalling

ITU-T D.600R AMD 1-2021 适用于国际自动电话服务的非洲区域资费组的成本方法 修正案 1 附件 B：非洲地区电信服务资费有效成本模型实施指南

Cost methodology for the regional tariff group for Africa applicable to the international automatic telephone service - Amendment 1 - Annex B: Guidelines for implementing efficient cost models for telecommunication service tariffs in the Africa region

ITU-T Q.834.4 AMD 2-2021 基于 UML 接口要求的宽带无源光网络的 CORBA 接口规范 修正案 2 用 IEEE 802.1Q 替换对 IEEE 802.1D 的引用

A CORBA interface specification for Broadband Passive Optical Networks based on UML interface requirements - Amendment 2 - Replace the reference to IEEE 802.1D by IEEE 802.1Q

ITU-T Q.834.1 AMD 1-2021 网络和网元视图的 ATM-PON 要求和管理实体；修正案 1

ATM-PON requirements and managed entities for the network and network element views; Amendment 1

YD/T 3912-2021 不同运营商富通信业务（RCS）互通测试规范（第二阶段）

Rich Communication Services (RCS) Interoperability Test Specifications of Different Operators (Phase 2)

YD/T 3911-2021 不同运营商富通信业务（RCS）互通总体技术要求（第二阶段）

Overall technical requirements for rich communication services (RCS) interoperability of different operators (second phase)

CEPT/ECC/REC/(15)02-2020 有关 E.164 号码的国家编号和拨号计划重大变更指南

Guidelines for Major changes to National Numbering and Dialling Plans concerning E.164 Numbers

SL/T 797-2020 水利空间数据交换协议

Water conservancy spatial data exchange protocol

YD/T 3369-2018 不同运营商IMS网间互通技术要求

Technical requirements for interoperability between IMS networks of different operators

YD/T 3370-2018 不同运营商IMS网间互通网关设备技术要求

Technical requirements for interworking gateway equipment between IMS networks of different operators

YD/T 3382-2018 统一IMS网络（第二阶段）与CDMA网络短消息互通信令技术要求

Unified signaling technical requirements for short message interoperability between IMS network (Phase 2) and CDMA network

YD/T 3372-2018 不同运营商富通信业务（RCS）互通总体技术要求

Overall technical requirements for rich communication services (RCS) interoperability of different operators

ITU-T G.973-2016 无中继器光纤海底电缆系统的特性（第 15 研究组）

Characteristics of repeaterless optical fibre submarine cable systems (Study Group 15)

ITU-T Q.1912.5D-2016 会话发起协议（SIP）和承载独立呼叫控制协议（BICC）或 ISDN 用户部分（ISUP）之间的互通：配置文件 C 的测试套件结构和测试目的（TSS&TP）

Interworking between session initiation protocol (SIP) and bearer independent call control protocol (BICC) or ISDN user part (ISUP): Test suite structure and test purposes (TSS&TP) for profile C

ITU-T Q.4005.3-2016 会议服务采用IP多媒体核心网子系统；一致性测试 第3部分：用户端；测试套件结构和测试目的

Conference service using IP multimedia core network subsystem; Conformance testing - Part 3: User side; Test suite structure and test purposes

ITU-T Q.4005.2-2016 会议服务采用IP多媒体核心网子系统；一致性测试 第2部分：网络端；测试套件结构和测试目的

Conference service using IP multimedia core network subsystem; Conformance testing - Part 2: Network side; Test suite structure and test purposes

ITU-T Q.4006.3-2016 使用IP多媒体核心网子系统的通信等待服务；一致性测试 第3部分：用户端；测试套件结构和测试目的

Communication waiting service using IP multimedia core network subsystem; Conformance testing - Part 3: User side; Test suite structure and test purposes

ITU-T Q.4006.2-2016 使用IP多媒体核心网子系统的通信等待服务；一致性测试 第2部分：网络端；测试套件结构和测试目的

Communication waiting service using IP multimedia core network subsystem; Conformance testing - Part 2: Network side; Test suite structure and test purposes

ITU-T G SUPP 39-2016 光学系统设计和工程考虑

Optical system design and engineering considerations

ITU-T Q.4002.1/Q.3943.1-2016 利用IP多媒体核心网子系统的主叫标识呈现和主叫标识限制；一致性测试 第1部分：网络端和用户端；协议实现一致性声明

Originating identification presentation and originating identification restriction using IP multimedia core network subsystem; Conformance testing - Part 1: Network side and user side; Protocol implementation conformance statement