文档介绍：VoLTE信令分析手册部门TDD网络基础性能部作者张艳丽00257121日期2015-4 目录 VoLTE信令分析手册..................................................................................................................................1 1 前言.........................................................................................................................................................2 2 初始注册................................................................................................................................................3 Initial attach.................................................................................................................................4 Attach Request(piggybacked PDN connectivity request).............................................4 Attach Accept(piggybacked Activate default EPS bearer context request).........................5 IMS PDN Connection建立........................................................................................................6 PDN connectivity request...................................................................................................6 E-RAB SETUP REQUEST.................................................................................................8 Activate default EPS bearer context request......................................................................8 IMS域SIP注册........................................................................................................................9 SIP Register.....................................................................................................................10 401 Unauthorized.............................................................................................................12 SIP Register.....................................................................................................................13 SIP 200 OK..........................................................................