目录

VoLTE 信令分析手册 .................................................................................................................................. 1

1 前言......................................................................................................................................................... 2

2 初始注册 ................................................................................................................................................ 3

2.1 Initial attach ................................................................................................................................. 4

2.1.1 Attach Request（piggybacked PDN connectivity request） ............................................. 4

2.1.2 Attach Accept(piggybacked Activate default EPS bearer context request)......................... 5

2.2 IMS PDN Connection 建立 ........................................................................................................ 6

2.2.1 PDN connectivity request ................................................................................................... 6

2.2.2 E-RAB SETUP REQUEST ................................................................................................. 8

2.2.3 Activate default EPS bearer context request ...................................................................... 8

2.3 IMS 域 SIP 注册 ........................................................................................................................ 9

2.3.1 SIP Register ..................................................................................................................... 10

2.3.2 401 Unauthorized ............................................................................................................. 12

2.3.3 SIP Register ..................................................................................................................... 13

2.3.4 SIP 200 OK ...................................................................................................................... 14

3 VoLTE 呼叫 VoLTE 流程 ..................................................................................................................... 15

3.1 主叫呼叫流程 ........................................................................................................................ 15

3.1.1 RRCConnectionRequest .................................................................................................. 17

3.1.2 RRCConnectionSetup ...................................................................................................... 17

3.1.3 RRCConnectionSetupComplete ....................................................................................... 19

3.1.4 INITIAL UE MESSAGE ..................................................................................................... 19

3.1.5 INITIAL CONTEXT SETUP REQUEST ............................................................................ 19

3.1.6 RRCConnectionReconfiguration（DRB setup-QCI9/QCI5） ......................................... 21

3.1.7 INITIAL CONTEXT SETUP RESPONSE ......................................................................... 23

3.1.8 SIP INVITE ....................................................................................................................... 24

3.1.9 SIP 100 TRYING .............................................................................................................. 28

3.1.10 SIP 183 Session Progress ........................................................................................... 28

3.1.11 AAR .............................................................................................................................. 29

3.1.12 AAA .............................................................................................................................. 31

3.1.13 E-RAB SETUP REQUEST ........................................................................................... 32

3.1.14 RRCConnectionReconfiguration（DRB setup-QCI1） .............................................. 33

3.1.15 ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST .................................. 34

3.1.16 SIP PRACK .................................................................................................................. 36

3.1.17 SIP 200 OK(PRACK) ................................................................................................... 37

3.1.18 SIP UPDATE ................................................................................................................ 37

3.1.19 SIP 200 OK（UPDATE） ........................................................................................... 38

3.1.20 SIP 180 ringing ............................................................................................................. 39

3.1.21 SIP 200 OK（INVITE） .............................................................................................. 39

3.1.22 SIP ACK ....................................................................................................................... 39

3.2 被叫呼叫建立流程 ............................................................................................................... 40

3.3 VoLTE 呼叫释放 ..................................................................................................................... 41

3.3.1 SIP BYE ........................................................................................................................... 42

3.3.2 SIP 200 OK（BYE） ....................................................................................................... 42

3.3.3 STR/STA .......................................................................................................................... 42

3.3.4 E-RAB RELEASE COMMAND ......................................................................................... 43

3.3.5 Deactivate EPS bearer context request ........................................................................... 43