ICS 33.060 M36 YD 中华人民共和国 通信行业标准 YD/T XXXX—XXXX 基于LTE技术的宽带集群通信（ B-TrunC） 系统（第二阶段）接口技术要求 集群核心 网到调度台接口 Technical requirements for interface between trunking core network and dispatcher of LTE based Broadband Trunking Communication(B-TrunC) system (Phase 2) （报批稿） XXXX - XX - XX发布 XXXX - XX - XX实施 中华人民共和国工业和信息化部 发 布 YD/T XXXX—XXXX I目  次 前言 .................................................................................. IV 1 范围 ................................................................................. 1 2 规范性引用文件 ....................................................................... 1 3 术语、定义和缩略语 ................................................................... 1 3.1 术语和定义 ....................................................................... 1 3.2 缩略语 ........................................................................... 2 4 接口模型 ............................................................................. 3 4.1 概述 ............................................................................. 3 4.2 控制面 ........................................................................... 3 4.3 用户面 ........................................................................... 3 5 信令流程 ............................................................................. 3 5.1 注册和注销 ....................................................................... 4 5.2 心跳检测 ......................................................................... 7 5.3 单呼 ............................................................................. 9 5.4 组呼 ............................................................................ 15 5.5 话权申请 ........................................................................ 19 5.6 实时短数据 /组播短消息 ........................................................... 25 5.7 遥晕/遥毙/复活 .................................................................. 27 5.8 视频调度 ........................................................................ 27 5.9 强插强拆 ........................................................................ 36 5.10 动态重组 ....................................................................... 38 5.11 调度台监听 ..................................................................... 41 5.12 调度台订阅 ..................................................................... 44 5.13 环境监听 /环境监视（可选） ...................................................... 46 5.14 呼叫转接 ....................................................................... 47 5.15 呼叫过程中改变媒体（可选） ..................................................... 49 6 SIP信令消息格式 .................................................................... 50 6.1 扩展消息 ........................................................................ 50 6.2 SDP协商机制 .................................................................... 53 7 SIP信令消息 ........................................................................ 53 7.1 概述 ............................................................................ 53 7.2 ACK消息 ........................................................................ 54 7.3 BYE消息 ........................................................................ 54 7.4 CANCEL消息 ..................................................................... 56 7.5 INFO消息 ....................................................................... 57 7.6 INVITE消息 ..................................................................... 59 7.7 MESSAGE消息 .................................................................... 68 YD/T XXXX—XXXX II7.8 OPTIONS消息 .................................................................... 83 7.9 REFER消息 ...................................................................... 85 7.10 REGISTER 消息 .................................................................. 85 7.11 SUBSCRIBER/NOTIFY 消息 ......................................................... 87 7.12 100 trying ........................