5G IMS第三方注册与Filter Criteria业务触发机制深度拆解

graph TB
    subgraph "IMS User Data (TS 29.228 Annex A)"
        UD["User Data<br/>XML Document"]
        UD --> SP["Service Profile"]
        UD --> PI["Public Identity Set"]

        SP --> FC1["Filter Criteria 1"]
        SP --> FC2["Filter Criteria 2"]
        SP --> FC3["Filter Criteria N..."]

        FC1 --> TP1["Trigger Point<br/>(SPT集合)"]
        FC1 --> AS1["Application Server<br/>sip:tas.ims.mnc000.mcc460.3gppnetwork.org"]
        FC1 --> PR1["Profile Part Indicator<br/>(Registered/Unregistered)"]

        TP1 --> SPT1["SPT: Method = REGISTER"]
        TP1 --> SPT2["SPT: Session Case = Originating"]
        TP1 --> SPT3["SPT: Session Description<br/>Line = a=sendrecv"]

        PI --> IMPU1["IMPU: sip:+86138xxx@ims"]
        PI --> IMPU2["IMPU: tel:+86138xxx"]
        PI --> Barring["Barring Indication<br/>(是否允许注册)"]
    end

    style UD fill:#e3f2fd
    style SP fill:#fff3e0
    style FC1 fill:#e8f5e9
    style FC2 fill:#e8f5e9
    style TP1 fill:#fce4ec
    style AS1 fill:#f3e5f5

<FilterCriteria>
  <Priority>0</Priority>
  <TriggerPoint>
    <ConditionTypeCNF>0</ConditionTypeCNF>  <!-- 0=AND, 1=OR -->
    <SPT>
      <ConditionNegated>0</ConditionNegated>  <!-- 0=不取反 -->
      <Group>0</Group>
      <Method>REGISTER</Method>
    </SPT>
    <SPT>
      <ConditionNegated>0</ConditionNegated>
      <Group>0</Group>
      <Header>
        <HeaderName>Content-Type</HeaderName>
        <HeaderContent>application/reginfo+xml</HeaderContent>
      </Header>
    </SPT>
  </TriggerPoint>
  <ApplicationServer>
    <ServerName>sip:tas.ims.mnc000.mcc460.3gppnetwork.org</ServerName>
    <DefaultHandling>0</DefaultHandling>  <!-- 0=继续会话, 1=终止会话 -->
    <ServiceInfo>ims-mmtel-voice</ServiceInfo>
  </ApplicationServer>
  <ProfilePartIndicator>0</ProfilePartIndicator>  <!-- 0=Registered -->
</FilterCriteria>

sequenceDiagram
    participant UE
    participant PCSCF as P-CSCF
    participant SCSCF as S-CSCF
    participant HSS
    participant TAS as TAS/AS
    participant MMTel as MMTel AS
    participant SCC as SCC AS

    Note over UE,SCSCF: 前置条件: IMS注册200 OK已返回UE
    Note over SCSCF: S-CSCF已通过Cx SAA获取<br/>User Data + Filter Criteria

    Note over SCSCF,TAS: 阶段1: 评估Filter Criteria - REGISTER触发
    SCSCF->>SCSCF: 遍历Filter Criteria列表<br/>按Priority排序
    SCSCF->>SCSCF: 匹配SPT: Method=REGISTER<br/>SessionCase=Originating<br/>ProfilePartIndicator=Registered

    Note over SCSCF,TAS: 阶段2: 向TAS发起Third-Party REGISTER
    SCSCF->>TAS: SIP REGISTER<br/>(From: S-CSCF, To: IMPU,<br/>Contact: IMPU@S-CSCF,<br/>expires=3600, Call-ID: scscf-tas-1)
    Note right of SCSCF: S-CSCF充当UA<br/>代表UE向AS注册

    TAS->>TAS: 验证S-CSCF身份<br/>检查用户签约数据
    TAS->>TAS: 初始化用户业务上下文<br/>加载CFU/CFC/CW/CLIR配置
    TAS-->>SCSCF: 200 OK (REGISTER)

    Note over SCSCF,MMTel: 阶段3: 向MMTel AS发起Third-Party REGISTER
    SCSCF->>MMTel: SIP REGISTER<br/>(From: S-CSCF, To: IMPU,<br/>expires=3600)
    MMTel->>MMTel: 激活MMTel语音补充业务<br/>OIP/OIR/CDIV/CW
    MMTel-->>SCSCF: 200 OK (REGISTER)

    Note over SCSCF,SCC: 阶段4: 向SCC AS发起Third-Party REGISTER
    SCSCF->>SCC: SIP REGISTER<br/>(From: S-CSCF, To: IMPU,<br/>expires=3600)
    SCC->>SCC: 注册T-ADS功能<br/>建立Multi-Device绑定
    SCC-->>SCSCF: 200 OK (REGISTER)

    Note over SCSCF,TAS: 阶段5: Filter Criteria中的INVITE触发规则生效
    Note over SCSCF: 后续UE发起INVITE时:<br/>匹配Filter Criteria(方法=INVITE,<br/>SessionCase=Originating)<br/>→ SIP INVITE先路由到TAS<br/>→ TAS执行补充业务逻辑<br/>→ TAS转发到目标

flowchart TD
    INVITE["UE → P-CSCF → S-CSCF<br/>SIP INVITE"] --> EVAL["S-CSCF评估<br/>Filter Criteria列表"]

    EVAL --> FC1{"FC Priority=0<br/>Method=INVITE<br/>SessionCase=Originating"}
    FC1 -->|"匹配"| ROUTE1["路由到TAS<br/>执行OCSI逻辑"]
    FC1 -->|"不匹配"| FC2

    ROUTE1 --> TAS_CHECK["TAS检查:<br/>- CLIR是否激活?<br/>- 呼叫限制?<br/>- CDIV触发?"]
    TAS_CHECK -->|"无前转"| FORWARD["TAS → S-CSCF<br/>→ I-CSCF → 被叫"]
    TAS_CHECK -->|"有CFU"| DIVERT["TAS执行呼叫前转<br/>修改Request-URI<br/>重新路由到前转目标"]
    TAS_CHECK -->|"有呼出限制"| REJECT["TAS返回<br/>SIP 603 Decline<br/>或403 Forbidden"]

    FC2{"FC Priority=1<br/>Method=INVITE<br/>SessionCase=Terminating"} -->|"匹配"| ROUTE2["路由到TAS<br/>执行TCSI逻辑"]

    ROUTE2 --> TAS_T["TAS检查:<br/>- CFB/CFNR/CFNL?<br/>- 呼叫等待?<br/>- OIP/OIR?"]

    style INVITE fill:#e1f5fe
    style TAS_CHECK fill:#fff3e0
    style TAS_T fill:#fce4ec

sequenceDiagram
    participant UE_O as UE (Calling)
    participant PCSCF_O as P-CSCF (O)
    participant SCSCF_O as S-CSCF (O)
    participant TAS_O as TAS (Originating)
    participant ICSCF_T as I-CSCF (T)
    participant SCSCF_T as S-CSCF (T)
    participant TAS_T as TAS (Terminating)
    participant PCSCF_T as P-CSCF (T)
    participant UE_T as UE (Called)

    UE_O->>PCSCF_O: SIP INVITE
    PCSCF_O->>SCSCF_O: SIP INVITE

    Note over SCSCF_O: 匹配Filter Criteria<br/>SessionCase=Originating<br/>Method=INVITE → Route to TAS

    SCSCF_O->>TAS_O: SIP INVITE (OCSI触发)
    Note over TAS_O: 执行主叫侧业务逻辑:<br/>1. 检查CLIR<br/>2. 检查呼出限制(ODB)<br/>3. 预付费扣费授权
    TAS_O->>SCSCF_O: SIP INVITE (业务处理完成,继续路由)

    SCSCF_O->>ICSCF_T: SIP INVITE (跨域路由)
    ICSCF_T->>SCSCF_T: SIP INVITE

    Note over SCSCF_T: 匹配Filter Criteria<br/>SessionCase=Terminating<br/>Method=INVITE → Route to TAS

    SCSCF_T->>TAS_T: SIP INVITE (TCSI触发)
    Note over TAS_T: 执行被叫侧业务逻辑:<br/>1. 检查CFB/CFNR<br/>2. 检查呼入限制<br/>3. 呼叫等待判断
    TAS_T->>SCSCF_T: SIP INVITE (无前转,继续路由)

    SCSCF_T->>PCSCF_T: SIP INVITE
    PCSCF_T->>UE_T: SIP INVITE

stateDiagram-v2
    [*] --> User_Data_Download: Cx SAA<br/>(IMS注册认证成功)
    User_Data_Download --> FC_Evaluation: 解析Filter Criteria<br/>按Priority排序

    FC_Evaluation --> TP_Reg: FC匹配REGISTER<br/>ProfilePartIndicator=Registered
    FC_Evaluation --> TP_UnReg: FC匹配REGISTER<br/>ProfilePartIndicator=Unregistered

    TP_Reg --> 3rd_Reg_TAS: Third-Party REGISTER → TAS
    TP_Reg --> 3rd_Reg_MMTel: Third-Party REGISTER → MMTel AS
    TP_Reg --> 3rd_Reg_SCC: Third-Party REGISTER → SCC AS

    3rd_Reg_TAS --> AS_Context_Active: TAS业务上下文激活<br/>(CFU/CW/CLIR配置加载)
    3rd_Reg_MMTel --> AS_Context_Active
    3rd_Reg_SCC --> AS_Context_Active

    AS_Context_Active --> INVITE_Trigger: 后续INVITE匹配FC<br/>触发到AS
    AS_Context_Active --> ReReg_Trigger: UE重注册<br/>触发Third-Party REGISTER刷新
    AS_Context_Active --> DeReg_Trigger: UE去注册/注册过期<br/>触发Third-Party De-Register

    DeReg_Trigger --> AS_Context_Cleanup: AS清除业务上下文
    AS_Context_Cleanup --> [*]

    TP_UnReg --> UnReg_Service: 未注册业务处理<br/>(如未注册呼入前转至语音信箱)
    UnReg_Service --> [*]

REGISTER sip:tas.ims.mnc000.mcc460.3gppnetwork.org SIP/2.0
From: <sip:scscf.ims.mnc000.mcc460.3gppnetwork.org>;tag=de-reg-001
To: <sip:[email protected]>
Contact: <sip:[email protected]>
Expires: 0
Call-ID: [email protected]
CSeq: 2 REGISTER

SUBSCRIBE sip:[email protected] SIP/2.0
Event: reg
Accept: application/reginfo+xml
Expires: 3600
Contact: <sip:+8613800138000@[UE_IP]:port_us>

<?xml version="1.0"?>
<reginfo xmlns="urn:ietf:params:xml:ns:reginfo" state="full" version="0">
  <registration aor="sip:[email protected]"
                id="reg1" state="active">
    <contact id="c1" state="active" event="registered" expires="3600">
      <uri>sip:+8613800138000@[UE_IP]:port_us</uri>
    </contact>
  </registration>
</reginfo>

sequenceDiagram
    participant TAS
    participant SCSCF as S-CSCF
    participant UE

    TAS->>SCSCF: SIP SUBSCRIBE (Event: reg)<br/>订阅IMPU注册状态
    SCSCF-->>TAS: 200 OK (SUBSCRIBE)

    Note over UE: UE网络异常断开<br/>注册超时
    SCSCF->>TAS: SIP NOTIFY<br/>(reginfo: state=terminated)
    Note over TAS: TAS感知UE离线<br/>激活未注册前转逻辑

    Note over UE: UE重新上线<br/>完成IMS注册
    SCSCF->>SCSCF: 触发Third-Party REGISTER刷新
    SCSCF->>TAS: Third-Party REGISTER (expires=3600)
    SCSCF->>TAS: SIP NOTIFY<br/>(reginfo: state=active)

PUBLISH sip:[email protected] SIP/2.0
Content-Type: application/xml

<?xml version="1.0"?>
<ims-3gpp-completedata xmlns="urn:xml:ns:ims-3gpp-completedata">
  <communication-diversion-condition>
    <diversion-not-reason></diversion-not-reason>
    <forward-to>
      <target>sip:[email protected]</target>
    </forward-to>
  </communication-diversion-condition>
</ims-3gpp-completedata>

# 过滤Third-Party REGISTER（S-CSCF → AS）
sip.Method == "REGISTER" && sip.From contains "scscf"

# 过滤特定IMPU的所有Filter Criteria触发
sip.To contains "+8613800138000"

# 过滤Cx Diameter交互（Filter Criteria下载）
diameter.Command-Code == 301   # SAR/SAA

# 过滤SIP NOTIFY（reg事件包）
sip.Method == "NOTIFY" && sip.Event == "reg"

# 过滤SIP PUBLISH（补充业务配置）
sip.Method == "PUBLISH"

AS → HSS: Sh-UDR (User-Data-Request)
  - User-Identity: sip:+8613800138000@ims...
  - Data-Reference: RepositoryData (0)
  - Service-Indication: "MMTel-CDIV"

HSS → AS: Sh-UDA (User-Data-Answer)
  - User-Data:
    <RepositoryData>
      <ServiceIndication>MMTel-CDIV</ServiceIndication>
      <ServiceData>
        <CDIV active="true">
          <ForwardTo>sip:+8613900139000@ims...</ForwardTo>
          <NoReplyTimer>20</NoReplyTimer>
        </CDIV>
      </ServiceData>
    </RepositoryData>