排除VoLTE中SRVCC切换时的音频呼叫转移问题

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已更新: 2019 年 10 月 14 日

文档 ID:214936

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简介

本文档介绍如何排除在SRVCC切换时VoLTE中的音频呼叫无法无缝传输时发生的问题。

先决条件

要求

Cisco 建议您了解以下主题：

5000/5500的硬件知识
StarOS

使用的组件

本文档不限于特定的软件和硬件版本。

本文档中的信息都是基于特定实验室环境中的设备编写的。
本文档中使用的所有设备最初均采用原始（默认）配置。如果您的网络处于活动状态，请确保您了解所有命令的潜在影响。

缩写

VoLTE	长期发展之声
SRVCC	单射频语音呼叫连续性
CCR	信用控制请求
CCA	信用控制答案
AVP	属性值对
PCRF	策略和计费规则功能
PCEF	策略和计费实施功能
SGW	服务网关
PGW	数据包数据网络网关
MME	移动管理实体

问题

服务提供商报告称，即使SRVCC在MME中成功切换，VoLTE呼叫也未无缝转接到传统2G/3G网络。SRVCC切换完成后，MME向SGW发送DELETE_BEARER_COMMAND消息，语音承载标志为true，并且PGW上的承载释放成功。
但是，在从PGW到PCRF的进一步通信中，观察到PGW不将PCRF作为PS_to_CS_Havson通知，即使SRVCC在MME端成功。

故障排除

本部分提供信息，以排除音频呼叫处理问题，当音频呼叫通过SRVCC切换从VoLTE传输到传统2G/3G网络时。

收集的“监控子”跟踪与SRVCC切换。以下是MME、SGW、PGW和PCRF之间交换的消息序列。

DELETE_BEARER_COMMAND消息从MME到SGW作为语音承载标志true:

INBOUND>>>>>  12:17:24:406 Eventid:141004(3)
[SGW-S11/S4]GTPv2C Rx PDU, from 10.206.33.X:30464 to 10.206.31.Y:2123 (57)
TEID: 0x81E0418E, Message type: EGTP_DELETE_BEARER_COMMAND (0x42)
Sequence Number: 0xD2101D (13766685)
GTP HEADER
        Version number: 2
        TEID flag: Present
        Piggybacking flag: Not present
        Message Priority flag: Not present
        Message Priority: NA
        Message Length: 0x0035 (53)

INFORMATION ELEMENTS
        BEARER CONTEXT:
            Type: 93  Length: 10  Inst: 0
            Value:
                EPS BEARER ID:
                    Type: 73  Length: 1  Inst: 0
                    Value: 7
                BEARER FLAGS:
                    Type: 97  Length: 1  Inst: 0
                    Value:
                        VB : 1                                   >> voice bearer as true
        ULI TIMESTAMP:
            Type: 170  Length: 4  Inst: 0
            Value:
                Seconds: 3766718840

        USER LOCATION INFO:
            Type: 86  Length: 13  Inst: 0
            Value:
                Location type: TAI
                MCC: XYZ
                MNC: AB
                TAC: 0x7D5
                Location type: ECGI
                MCC: XYZ
                MNC: AB
                ECI: 0xE02F902

        UE TIME ZONE:
            Type: 114  Length: 2  Inst: 0
            Value:
                TZ: +5:30
                DST: +0 hour

此外，SGW将EGTP_DELETE_BEARER_COMMAND消息发送到PGW:

INBOUND>>>>>  12:17:24:407 Eventid:141004(3)
[PGW-S5/S2a/S2b]GTPv2C Rx PDU, from 223.224.X.Y:36368 to 223.224.A.B:2123 (57)
TEID: 0x80F0E1DB, Message type: EGTP_DELETE_BEARER_COMMAND (0x42)
Sequence Number: 0xAD818E (11370894)
GTP HEADER
        Version number: 2
        TEID flag: Present
        Piggybacking flag: Not present
        Message Priority flag: Not present
        Message Priority: NA
        Message Length: 0x0035 (53)

INFORMATION ELEMENTS
        BEARER CONTEXT:
            Type: 93  Length: 10  Inst: 0
            Value:
                EPS BEARER ID:
                    Type: 73  Length: 1  Inst: 0
                    Value: 7
                BEARER FLAGS:
                    Type: 97  Length: 1  Inst: 0
                    Value:
                        VB : 1                                   >> voice bearer as true
        ULI TIMESTAMP:
            Type: 170  Length: 4  Inst: 0
            Value:
                Seconds: 3766718840
        USER LOCATION INFO:
            Type: 86  Length: 13  Inst: 0
            Value:
                Location type: TAI
                MCC: XYZ
                MNC: AB
                TAC: 0x7D5
                Location type: ECGI
                MCC: XYZ
                MNC: AB
                ECI: 0xE02F902
        UE TIME ZONE:
            Type: 114  Length: 2  Inst: 0
            Value:
                TZ: +5:30
                DST: +0 hour

此外，PGW接受DELETE_BEARER并启动对承载的删除：

<<<
     
      
      
 
      [PGW-S5/S2a/S2b]GTPv2C Tx PDU, from 223.224.A.B:2123 to 223.224.X.Y:36368 (17) 
      
 
      TEID: 0x80F3C18E, Message type: EGTP_DELETE_BEARER_REQUEST (0x63) 
      
 
      Sequence Number: 0xAD818E (11370894) 
      
 
      GTP HEADER 
      
 
              Version number: 2 
      
 
              TEID flag: Present 
      
 
              Piggybacking flag: Not present 
      
 
              Message Priority flag: Not present 
      
 
              Message Priority: NA 
      
 
              Message Length: 0x000D (13) 
      
 
      
 
      INFORMATION ELEMENTS 
      
 
              EPS BEARER ID: 
      
 
                  Type: 73  Length: 1  Inst: 1 
      
 
                  Value: 7

此外，PGW向PCRF发起CCR更新消息。在此，在计费规则报告AVP中，PGW通知PCRF计费规则名称、PCC规则状态和规则故障代码。

此处发现PGW向PCRF发送了错误的Rule-Failure-Code。当MME指示释放语音承载（因为标志为真）时，PGW应将PCRF通知为PS_to_CS切换。相反，存在报告给PCRF的Resource_Allocation_failure。

因此，PCRF考虑4G网络故障，并将故障通知给IMS。因此，IMS正在启动VoLTE呼叫终止。因此，尽管SRVCC成功，但呼叫并未无缝转接到传统的2G/3G网络。

In 3GPP TS 29.212 V13.5.0 (2016-03)
As mentioned in section 3.6, Request of IP-CAN Bearer Termination
If the IP-CAN bearer termination is caused by the PS to CS handover, the PCEF shall report related PCC rules for this IP-CAN bearer by including the Rule-Failure-Code AVP
set to the value PS_TO_CS_HANDOVER.

In 3GPP TS 29.212 V14.3.0 (2017-03)
As mentioned in section 4.5.6 Indication of IP-CAN Bearer Termination Implications
When the PCEF detects that a dedicated IP-CAN bearer could not be activated or has been terminated it shall remove the affected PCC rules and send a CCR command to the PCRF
with CC-Request-Type AVP set to the value "UPDATE_REQUEST", including the Charging-Rule-Report AVP specifying the affected PCC rules with the PCC-Rule-Status set to inactive
and including the Rule-Failure-Code AVP assigned to the value RESOURCE_ALLOCATION_FAILURE.

SRVCC PS-to-CS Handover Indication Support in starOS
This feature helps in notifying the PCRF about the exact reason for PCC rule deactivation on Voice bearer deletion.
This exact cause will help PCRF to then take further action appropriately.
This feature ensures complete compliance for SRVCC, including support for PS-to-CS handover indication when voicebearers are released.
If the IP-CAN bearer termination is caused by the PS to CS handover, the PCEF may report related PCC rules for thisIP-CAN bearer by including the Rule-Failure-Code AVP set to the value PS_TO_CS_HANDOVER.

从PGW到PCRF的有关计费规则报告AVP的CCR更新消息：

<<<
      
       
       
 
       Diameter message from 10.0.232.X:32933 to 10.5.40.Y:3869 
       
 
         Base Header Information: 
       
 
          Version:            0x01        (1) 
       
 
          Message Length:     0x000260    (608) 
       
 
          Command Flags:      0xc0        (192) REQ PXY  
       
 
          Command Code:       0x000110    (272) Credit-Control-Request 
       
 
          Application ID:     0x01000016  (16777238)   3GPP-Gx 
       
 
          Hop2Hop-ID:         0xb7cf10ce  (3083800782) 
       
 
          End2End-ID:         0x3b6b4886  (996886662) 
       
 
         AVP Information: 
       
 
            [M]  Session-Id 
       
 
               Code:      0x00000107 (263) Session-Id 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00004f   (79) 
       
 
               Data: 0003-diamproxy.asr55k.gx;1385806608;584234203;5cd9037d-1db02 
       
 
       
 
            [M]  Auth-Application-Id 
       
 
               Code:      0x00000102 (258) Auth-Application-Id 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00000c   (12) 
       
 
               Data: 16777238 
       
 
       
 
            [M]  Origin-Host 
       
 
               Code:      0x00000108 (264) Origin-Host 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00002b   (43) 
       
 
               Data: 0003-diamproxy.asr55k.gx 
       
 
       
 
            [M]  Origin-Realm 
       
 
               Code:      0x00000128 (296) Origin-Realm 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00001a   (26) 
       
 
               Data: cisco.com 
       
 
       
 
           [M]  Destination-Realm 
       
 
               Code:      0x0000011b (283) Destination-Realm 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00002a   (42) 
       
 
               Data: PCRF.MNC0AB.MCCXYZ.3GPPNETWORK.ORG 
       
 
       
 
            [M]  CC-Request-Type 
       
 
               Code:      0x000001a0 (416) CC-Request-Type 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00000c   (12) 
       
 
               Data: UPDATE_REQUEST (2) 
       
 
       
 
            [M]  CC-Request-Number 
       
 
               Code:      0x0000019f (415) CC-Request-Number 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00000c   (12) 
       
 
               Data: 2 
       
 
       
 
            [M]  Destination-Host 
       
 
               Code:      0x00000125 (293) Destination-Host 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x000037   (55) 
       
 
               Data: PCRF01.PCRF.MNC0AB.MCCXYZ.3GPPNETWORK.ORG 
       
 
       
 
            [M]  Origin-State-Id 
       
 
               Code:      0x00000116 (278) Origin-State-Id 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00000c   (12) 
       
 
               Data: 1552081338 
       
 
       
 
            [M]  Subscription-Id 
       
 
               Code:      0x000001bb (443) Subscription-Id 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x000028   (40) 
       
 
                [M]  Subscription-Id-Type 
       
 
                   Code:      0x000001c2 (450) Subscription-Id-Type 
       
 
                   Flags:     0x40       (64)  [M] 
       
 
                   Length:    0x00000c   (12) 
       
 
                   Data: END_USER_E164 (0) 
       
 
       
 
                [M]  Subscription-Id-Data 
       
 
                   Code:      0x000001bc (444) Subscription-Id-Data 
       
 
                   Flags:     0x40       (64)  [M] 
       
 
                   Length:    0x000014   (20) 
       
 
                   Data: 121234567891 
       
 
       
 
            [M]  Subscription-Id 
       
 
               Code:      0x000001bb (443) Subscription-Id 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00002c   (44) 
       
 
                [M]  Subscription-Id-Type 
       
 
                   Code:      0x000001c2 (450) Subscription-Id-Type 
       
 
                   Flags:     0x40       (64)  [M] 
       
 
                   Length:    0x00000c   (12) 
       
 
                   Data: END_USER_IMSI (1) 
       
 
       
 
                [M]  Subscription-Id-Data 
       
 
                   Code:      0x000001bc (444) Subscription-Id-Data 
       
 
                   Flags:     0x40       (64)  [M] 
       
 
                   Length:    0x000017   (23) 
       
 
                   Data: XYZAB1234567891 
       
 
       
 
            [M]  Framed-IPv6-Prefix 
       
 
               Code:      0x00000061 (97) Framed-IPv6-Prefix 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x000012   (18) 
       
 
               Data: Reserved: 00 Prefixlen: 64 IPv6 prefix: 2401:4900:4097:f050:: 
       
 
       
 
            [M]  User-Equipment-Info 
       
 
               Code:      0x000001ca (458) User-Equipment-Info 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00002c   (44) 
       
 
                [M]  User-Equipment-Info-Type 
       
 
                   Code:      0x000001cb (459) User-Equipment-Info-Type 
       
 
                   Flags:     0x40       (64)  [M] 
       
 
                   Length:    0x00000c   (12) 
       
 
                   Data: IMEISV (0) 
       
 
       
 
                [M]  User-Equipment-Info-Value 
       
 
                   Code:      0x000001cc (460) User-Equipment-Info-Value 
       
 
                   Flags:     0x40       (64)  [M] 
       
 
                   Length:    0x000018   (24) 
       
 
                   Data: 9876543211234 
       
 
       
 
            [M]  Called-Station-Id 
       
 
               Code:      0x0000001e (30) Called-Station-Id 
       
 
               Flags:     0x40       (64)  [M] 
       
 
               Length:    0x00000b   (11) 
       
 
               Data: ims 
       
 
       
 
            [V] [M]  Charging-Rule-Report 
       
 
               Code:      0x000003fa (1018) Charging-Rule-Report 
       
 
               Flags:     0xc0       (192) [V]  [M] 
       
 
               Length:    0x00006c   (108) 
       
 
               Vendor-Id: 0x000028af (10415) 3GPP 
       
 
                [V] [M]  Charging-Rule-Name 
       
 
                   Code:      0x000003ed (1005) Charging-Rule-Name 
       
 
                   Flags:     0xc0       (192) [V]  [M] 
       
 
                   Length:    0x00001e   (30) 
       
 
                   Vendor-Id: 0x000028af (10415) 3GPP 
       
 
                   Data: I_AD_VOLTE00F72513 
       
 
       
 
                [V] [M]  Charging-Rule-Name 
       
 
                   Code:      0x000003ed (1005) Charging-Rule-Name 
       
 
                   Flags:     0xc0       (192) [V]  [M] 
       
 
                   Length:    0x00001e   (30) 
       
 
                   Vendor-Id: 0x000028af (10415) 3GPP 
       
 
                   Data: I_AD_VOLTE00F72512 
       
 
       
 
                [V] [M]  PCC-Rule-Status 
       
 
                   Code:      0x000003fb (1019) PCC-Rule-Status 
       
 
                   Flags:     0xc0       (192) [V]  [M] 
       
 
                   Length:    0x000010   (16) 
       
 
                   Vendor-Id: 0x000028af (10415) 3GPP 
       
 
                   Data: INACTIVE (1) 
       
 
       
 
                [V] [M]  Rule-Failure-Code 
       
 
                   Code:      0x00000407 (1031) Rule-Failure-Code 
       
 
                   Flags:     0xc0       (192) [V]  [M] 
       
 
                   Length:    0x000010   (16) 
       
 
                   Vendor-Id: 0x000028af (10415) 3GPP 
       
 
                   Data: RESOURCE_ALLOCATION_FAILURE (10)                          >> failure code is incorrect. It should be PS_CS_Handover 
       
 
       
 
            [V] [M]  Access-Network-Charging-Address 
       
 
               Code:      0x000001f5 (501) Access-Network-Charging-Address 
       
 
               Flags:     0xc0       (192) [V]  [M] 
       
 
               Length:    0x000012   (18) 
       
 
               Vendor-Id: 0x000028af (10415) 3GPP 
       
 
               Data: IPv4 223.224.X.Y

解决方案

在客户网络rel-8 diameter字典中使用。发现版本8不支持PS_CS_Havsing。
因此，您需要将词典更新为3gpp-r10。将词典更新为3gpp-r10后，原因将作为PS_CS_Havson正确发送。
此后，最终用户音频呼叫可能能够从VoLTE无缝切换到传统2G/3G网络。

ims-auth-service DRA_Gx_SPG
   policy-control
     diameter dictionary r8-gx-standard
     diameter update-dictionary-avps 3gpp-r10    << diameter dictionary updated to 3gpp-r10

从SGW到PGW的DELETE_BEARER_COMMAND消息作为语音承载标志true:

INBOUND>>>>>  From sessmgr:205 tpc_interface.c:1338 (Callid 3cda3ef4) 13:28:21:659 Eventid:141004(3)
[PGW-S5/S2a/S2b]GTPv2C Rx PDU, from 223.224.M.N:39632 to 223.224.P.Q:2123 (57)
TEID: 0x845800CD, Message type: EGTP_DELETE_BEARER_COMMAND (0x42)
Sequence Number: 0xE9625A (15295066)
GTP HEADER
        Version number: 2
        TEID flag: Present
        Piggybacking flag: Not present
        Message Priority flag: Not present
        Message Priority: NA
        Message Length: 0x0035 (53)

INFORMATION ELEMENTS
        BEARER CONTEXT:
            Type: 93  Length: 10  Inst: 0
            Value:
                EPS BEARER ID:
                    Type: 73  Length: 1  Inst: 0
                    Value: 7

                BEARER FLAGS:
                    Type: 97  Length: 1  Inst: 0
                    Value:
                        VB : 1                                   >> voice bearer as true

        ULI TIMESTAMP:
            Type: 170  Length: 4  Inst: 0
            Value:
                Seconds: 3769747091
        USER LOCATION INFO:
            Type: 86  Length: 13  Inst: 0
            Value:
                Location type: TAI
                MCC: XYZ
                MNC: AB
                TAC: 0x844
                Location type: ECGI
                MCC: XYZ
                MNC: AB
                ECI: 0xDCF8C02

        UE TIME ZONE:
            Type: 114  Length: 2  Inst: 0
            Value:
                TZ: +5:30
                DST: +0 hour

此外，PGW接受它并启动承载的释放。

<<<
       
        
        
 
        [PGW-S5/S2a/S2b]GTPv2C Tx PDU, from 223.224.M.N:2123 to 223.224.P.Q:39632 (17) 
        
 
        TEID: 0x8064A25A, Message type: EGTP_DELETE_BEARER_REQUEST (0x63) 
        
 
        Sequence Number: 0xE9625A (15295066) 
        
 
        GTP HEADER 
        
 
                Version number: 2 
        
 
                TEID flag: Present 
        
 
                Piggybacking flag: Not present 
        
 
                Message Priority flag: Not present 
        
 
                Message Priority: NA 
        
 
                Message Length: 0x000D (13) 
        
 
        
 
        INFORMATION ELEMENTS 
        
 
                EPS BEARER ID: 
        
 
                    Type: 73  Length: 1  Inst: 1 
        
 
                    Value: 7

从PGW到PCRF的CCR，与计费规则报告AVP有关，故障代码被视为PS_CS_Havson。

<<<
        
         
         
 
         Diameter message from 10.206.17.X:51119 to 10.5.40.Y:3007 
         
 
           Base Header Information: 
         
 
            Version:            0x01        (1) 
         
 
            Message Length:     0x000260    (608) 
         
 
            Command Flags:      0xc0        (192) REQ PXY  
         
 
            Command Code:       0x000110    (272) Credit-Control-Request 
         
 
            Application ID:     0x01000016  (16777238)   3GPP-Gx 
         
 
            Hop2Hop-ID:         0xaebac4d3  (2931475667) 
         
 
            End2End-ID:         0x19b8ec95  (431549589) 
         
 
           AVP Information: 
         
 
              [M]  Session-Id 
         
 
                 Code:      0x00000107 (263) Session-Id 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00004e   (78) 
         
 
                 Data: 0007-diamproxy.asr55k.dra.gx;1020935924;202167245;5d0747d1-cd02 
         
 
         
 
              [M]  Auth-Application-Id 
         
 
                 Code:      0x00000102 (258) Auth-Application-Id 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00000c   (12) 
         
 
                 Data: 16777238 
         
 
         
 
              [M]  Origin-Host 
         
 
                 Code:      0x00000108 (264) Origin-Host 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00002b   (43) 
         
 
                 Data: 0007-diamproxy.asr55k.dra.gx 
         
 
         
 
              [M]  Origin-Realm 
         
 
                 Code:      0x00000128 (296) Origin-Realm 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00001a   (26) 
         
 
                 Data: cisco.com 
         
 
         
 
              [M]  Destination-Realm 
         
 
                 Code:      0x0000011b (283) Destination-Realm 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00002a   (42) 
         
 
                 Data: PCRF.MNC0AB.MCCXYZ.3GPPNETWORK.ORG 
         
 
         
 
              [M]  CC-Request-Type 
         
 
                 Code:      0x000001a0 (416) CC-Request-Type 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00000c   (12) 
         
 
                 Data: UPDATE_REQUEST (2) 
         
 
         
 
              [M]  CC-Request-Number 
         
 
                 Code:      0x0000019f (415) CC-Request-Number 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00000c   (12) 
         
 
                 Data: 2 
         
 
         
 
              [M]  Destination-Host 
         
 
                 Code:      0x00000125 (293) Destination-Host 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x000037   (55) 
         
 
                 Data: PCRF01.NO.DC.PCRF.MNC0AB.MCCXYZ.3GPPNETWORK.ORG 
         
 
         
 
              [M]  Origin-State-Id 
         
 
                 Code:      0x00000116 (278) Origin-State-Id 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00000c   (12) 
         
 
                 Data: 1559087623 
         
 
         
 
              [M]  Subscription-Id 
         
 
                 Code:      0x000001bb (443) Subscription-Id 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x000028   (40) 
         
 
                  [M]  Subscription-Id-Type 
         
 
                     Code:      0x000001c2 (450) Subscription-Id-Type 
         
 
                     Flags:     0x40       (64)  [M] 
         
 
                     Length:    0x00000c   (12) 
         
 
                     Data: END_USER_E164 (0) 
         
 
         
 
                 [M]  Subscription-Id-Data 
         
 
                     Code:      0x000001bc (444) Subscription-Id-Data 
         
 
                     Flags:     0x40       (64)  [M] 
         
 
                     Length:    0x000014   (20) 
         
 
                     Data: 121234567891 
         
 
         
 
              [M]  Subscription-Id 
         
 
                 Code:      0x000001bb (443) Subscription-Id 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00002c   (44) 
         
 
                  [M]  Subscription-Id-Type 
         
 
                     Code:      0x000001c2 (450) Subscription-Id-Type 
         
 
                     Flags:     0x40       (64)  [M] 
         
 
                     Length:    0x00000c   (12) 
         
 
                     Data: END_USER_IMSI (1) 
         
 
         
 
                  [M]  Subscription-Id-Data 
         
 
                     Code:      0x000001bc (444) Subscription-Id-Data 
         
 
                     Flags:     0x40       (64)  [M] 
         
 
                     Length:    0x000017   (23) 
         
 
                     Data: XYZAB1234567891 
         
 
         
 
              [M]  Framed-IPv6-Prefix 
         
 
                 Code:      0x00000061 (97) Framed-IPv6-Prefix 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x000012   (18) 
         
 
                 Data: Reserved: 00 Prefixlen: 64 IPv6 prefix: 2401:4900:4071:32ec:: 
         
 
         
 
              [M]  User-Equipment-Info 
         
 
                 Code:      0x000001ca (458) User-Equipment-Info 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00002c   (44) 
         
 
                  [M]  User-Equipment-Info-Type 
         
 
                     Code:      0x000001cb (459) User-Equipment-Info-Type 
         
 
                     Flags:     0x40       (64)  [M] 
         
 
                     Length:    0x00000c   (12) 
         
 
                     Data: IMEISV (0) 
         
 
         
 
                  [M]  User-Equipment-Info-Value 
         
 
                     Code:      0x000001cc (460) User-Equipment-Info-Value 
         
 
                     Flags:     0x40       (64)  [M] 
         
 
                     Length:    0x000018   (24) 
         
 
                     Data: 9876543211234 
         
 
         
 
              [M]  Called-Station-Id 
         
 
                 Code:      0x0000001e (30) Called-Station-Id 
         
 
                 Flags:     0x40       (64)  [M] 
         
 
                 Length:    0x00000b   (11) 
         
 
                 Data: ims 
         
 
         
 
              [V] [M]  Charging-Rule-Report 
         
 
                 Code:      0x000003fa (1018) Charging-Rule-Report 
         
 
                 Flags:     0xc0       (192) [V]  [M] 
         
 
                 Length:    0x00006c   (108) 
         
 
                 Vendor-Id: 0x000028af (10415) 3GPP 
         
 
                  [V] [M]  Charging-Rule-Name 
         
 
                     Code:      0x000003ed (1005) Charging-Rule-Name 
         
 
                     Flags:     0xc0       (192) [V]  [M] 
         
 
                     Length:    0x00001e   (30) 
         
 
                     Vendor-Id: 0x000028af (10415) 3GPP 
         
 
                     Data: I_AD_VOLTE03D4E98A 
         
 
         
 
                  [V] [M]  Charging-Rule-Name 
         
 
                     Code:      0x000003ed (1005) Charging-Rule-Name 
         
 
                     Flags:     0xc0       (192) [V]  [M] 
         
 
                     Length:    0x00001e   (30) 
         
 
                     Vendor-Id: 0x000028af (10415) 3GPP 
         
 
                     Data: I_AD_VOLTE03D4E989 
         
 
         
 
                  [V] [M]  PCC-Rule-Status 
         
 
                     Code:      0x000003fb (1019) PCC-Rule-Status 
         
 
                     Flags:     0xc0       (192) [V]  [M] 
         
 
                     Length:    0x000010   (16) 
         
 
                     Vendor-Id: 0x000028af (10415) 3GPP 
         
 
                     Data: INACTIVE (1) 
         
 
         
 
                  [V] [M]  Rule-Failure-Code 
         
 
                     Code:      0x00000407 (1031) Rule-Failure-Code 
         
 
                     Flags:     0xc0       (192) [V]  [M] 
         
 
                     Length:    0x000010   (16) 
         
 
                     Vendor-Id: 0x000028af (10415) 3GPP 
         
 
                     Data: PS_TO_CS_HANDOVER (13)                         >> failure code seen as PS_to_CS_Handover    
         
 
         
 
              [V] [M]  Access-Network-Charging-Address 
         
 
                 Code:      0x000001f5 (501) Access-Network-Charging-Address 
         
 
                 Flags:     0xc0       (192) [V]  [M] 
         
 
                 Length:    0x000012   (18) 
         
 
                 Vendor-Id: 0x000028af (10415) 3GPP 
         
 
                 Data: IPv4 223.224.X.Y

需要使用适当的直径字典，通过SRVCC切换将4G中的VoLTE音频呼叫无缝切换到传统2G/3G网络。在ims-auth-service下，直径字典更新为3gpp-rel10后，支持此功能。

由思科工程师提供

Satya Narayan Panda
Cisco TAC Engineer

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