中国电信集团公司技术标准Q/CT2032-2008中国电信cdma2000核心网络接口协议技术规范―SIP-I协议规范TechnicalSpecificationofInterface&Protocolincdma2000CoreNetworkofChinaTelecom－SIP-I（V1.0）2008-07-14发布2008-07-14实施中国电信集团公司发布保密等级：公开发放目录前言...............................................................................................................................................41范围...............................................................................................................................................12引用标准.......................................................................................................................................13术语说明.......................................................................................................................................24ZZ接口涉及的网元及协议说明.................................................................................................35通用要求.......................................................................................................................................36MSCE对SIP/SDP协议能力集的适配要求...............................................................................47音资源适配要求...........................................................................................................................47.1总则要求...................................................................................................................................47.2SIP消息对音资源行为的适配................................................................................................57.3提供EALRYMEDIA实体的行为要求......................................................................................67.4接收EARLYMEDIA实体的行为要求.......................................................................................67.4.1基本信令适配..................................................................................................................67.4.2特殊约定说明..................................................................................................................78编码协商说明...............................................................................................................................79LMSD网络对SIP协议重叠发码的要求....................................................................................710会话建立后的周期更新（呼叫心跳）...................................................................................711MSCE基本信令行为说明...........................................................................................................811.1主叫侧MSCE...........................................................................................................................811.2被叫侧网络MSCE...................................................................................................................912切换行为说明.........................................................................................................................1012.1总体说明.................................................................................................................................1012.2定时器描述................................................................................................................................
