1 移動呼叫電信，主叫提示對方正在通話中，請稍后再撥

網路問題，

在有問題的那通電話前的一通電話，
主叫07:00:24.378 [0x156E] IMS SIP Message掛斷電話，
Version = 1
Version 1 {
Direction = NETWORK_TO_UE
SDP Presence = 0
SIP Call ID Length = 60
SIP Message Length = 516
SIP Message Logged Bytes = 517
Message ID = IMS_SIP_INVITE
Response Code = REQUEST_TERMINATED (487)

被叫07:00:18 回鈴音，
07:00:18.792 [0x156E] IMS SIP Message
Version = 1
Version 1 {
Direction = UE_TO_NETWORK
SDP Presence = 0
SIP Call ID Length = 40
SIP Message Length = 756
SIP Message Logged Bytes = 757
Message ID = IMS_SIP_INVITE
Response Code = RINGING (180)

但被叫在收到來電通知后并沒有收到網路的掛斷信令，直到30s超時，被叫主動聯系網路，網路才掛斷電話

[0x156E] OTA LOG 07:00:18.776 IMS SIP Message Length: 748
[0x156E] OTA LOG 07:00:18.785 IMS SIP Message Length: 644
[0x156E] OTA LOG 07:00:18.792 IMS SIP Message Length: 829
[0x156E] OTA LOG 07:00:38.505 IMS SIP Message Length: 904
[0x1830] OTA LOG 07:00:38.510 IMS VoLTE Session Setup Length: 194
[0x156E] OTA LOG 07:00:38.648 IMS SIP Message Length: 627
[0x1831] OTA LOG 07:00:40.704 IMS VoLTE Session End Length: 194
[0x156E] OTA LOG 07:00:40.711 IMS SIP Message Length: 1072
[0x156E] OTA LOG 07:00:40.816 IMS SIP Message Length: 419

[0x156E] OTA LOG 07:00:38.505 IMS SIP Message Length: 904

被叫主動聯系網路
07:00:38.505 [0x156E] IMS SIP Message
Version = 1
Version 1 {
Direction = UE_TO_NETWORK
SDP Presence = 0
SIP Call ID Length = 40
SIP Message Length = 831
SIP Message Logged Bytes = 832
Message ID = IMS_SIP_INVITE

網路回復主叫掛斷End Cause = MO initiated
07:00:40.704 [0x1831] IMS VoLTE Session End
Version = 2
Version 2 {
Dialled String Length = 49
Dialled String = sip:[240e:57d:605:8242:ea55:1df9:2cd0:3f9b]:40581
Direction = MT
Call Id Length = 39
Call Id = HO4dCNWeUURRZ1g2-2XOmZ3Nkik4hahi@zteims
Type = 0
Originating Uri Length = 18
Originating Uri = tel:+8613924668527
Terminating Uri Length = 55
Terminating Uri = sip:[email protected]
End Cause = MO initiated
Call Setup Delay = 0
Rat = DCM_RAT_LTE
}

所以由于此時被叫側網路并沒有掛斷電話，所以 主叫07:00:33.823 [0x156E] IMS SIP Message的電話提示通話中，
Version = 1
Version 1 {
Direction = UE_TO_NETWORK
SDP Presence = 1
SIP Call ID Length = 60
SIP Message Length = 2185
SIP Message Logged Bytes = 2186
Message ID = IMS_SIP_INVITE
Response Code = INFORMAL_RESPONSE (0)

2終端呼叫中提示對方已進行來電轉接

被叫上一個通話在這個點斷開，
02:11:24.810 [0x1831] IMS VoLTE Session End
Version = 2
Version 2 {
Dialled String Length = 88
Dialled String = sip:4e4e06e2-ea57-464c-ae7f-59b07f15de45@[2409:8809:B102:E860:DFEE:A40B:55C7:75E0]:41961
Direction = MT
Call Id Length = 59
Call Id = [email protected]
Type = 0
Originating Uri Length = 66
Originating Uri = tel:13670200327;noa=subscriber;srvattri=national;phone-context=+86
Terminating Uri Length = 71
Terminating Uri = sip:+8613902448387@[2409:8019:8430:4300:0000:0000:0000:0000];user=phone
End Cause = MT initiated
Call Setup Delay = 0
Rat = DCM_RAT_LTE

02:11:06（相當于被叫叫的02:11:24時刻）主叫發起斷開，斷開2s后發起起呼，

被叫斷開volte eps beare 后， TAU發起更新，進入了新的local area，
[0xB0E2] OTA LOG 02:11:24.948 LTE NAS ESM Plain OTA Incoming MessageDeactivate EPS bearer context request Msg
[0xB0E3] OTA LOG 02:11:24.948 LTE NAS ESM Plain OTA Outgoing MessageDeactivate EPS bearer context accept Msg
[0xB0ED] OTA LOG 02:11:25.286 LTE NAS EMM Plain OTA Outgoing MessageTracking area update request Msg
[0xB0EC] OTA LOG 02:11:25.379 LTE NAS EMM Plain OTA Incoming MessageTracking area update accept Msg
[0xB0ED] OTA LOG 02:11:25.381 LTE NAS EMM Plain OTA Outgoing MessageTracking area update complete Msg
在 TAU accept中更新為m_tmsi = 3695963874 (0xdc4beee2)，即11011100 01001011 11101110 11100010

但在后續paging訊息的pagingRecordList沒有找到此tmsi，

所以網路側沒有向終端發尋呼，網路的問題，