call forwarding调查

目录(?)[+]

call forwarding介绍

call forwarding是call增值业务；在TS24082中有详细的介绍 呼叫转移有3方用户

• A：呼叫方；（Calling mobile subscriber side）
• B：被叫方且设置有呼叫转移业务；（Served mobile subscriber side）
• C：呼叫转移接受方，即B设置的呼叫转移的接受方；（Forwarded-to mobile subscriber side）

整个流程即：

• 前提条件 B设置了呼叫转移给C方
• A打电话给B
• 满足呼叫转移的4个条件之一， B转移电话给C
• A和C进行通话

各种呼叫转移流程

CFU 无条件呼叫转移

• A方流程

   MS                                                           Network 

                                            SETUP 

    ------------------------------------------------------------------> 

                                           FACILITY 

      <----------------------------------------------------------------- 

                  Facility (Invoke = NotifySS (CFU, SS-Notification)) 

• B方 没有动作；
• C方

   MS                                                           Network 

                                            SETUP 

      < ---------------------------------------------------------------- 

                     Facility (Invoke = NotifySS (CFU, SS-Notification)) 

   Redirecting party BCD number (screening indicator, presentation indicator, redirecting party digits), Redirecting party subaddress 

CFB 用户忙时呼叫转移

• A方流程

   MS                                                                Network 

                                            SETUP 

     ----------------------------------------------------------------------> 

                                           FACILITY 

      <--------------------------------------------------------------------- 

                      Facility (Invoke = NotifySS (CFB, SS-Notification)) 

• B方

   MS                                                                   Network 

                                            SETUP 

      <----------------------------------------------------------------------- 

                                 RELEASE COMPLETE/RELEASE/DISCONNECT 

    -------------------------------------------------------------------------> 

                            ....Transaction Identifier (A-B).... 

                               ....Cause # 17 (User Busy).... 

                                    FACILITY (TI=B-X) 

      <------------------------------------------------------------------------ 

                    Facility (Invoke = NotifySS (CFB, SS-Notification)) 

• C方

   MS                                                                  Network 

                                            SETUP 

      < ---------------------------------------------------------------------- 

                      Facility (Invoke = NotifySS (CFB, SS-Notification)) 

   Redirecting party BCD number (screening indicator, presentation indicator, redirecting party digits), Redirecting party subaddress 

CFNRy 无回应呼叫转移

• A方流程

   MS                                                                    Network 

                                            SETUP 

     ---------------------------------------------------------------------------------> 

                                           FACILITY 

      <------------------------------------------------------------------------ 

                      Facility (Invoke = NotifySS (CFNRy, SS-Notification)) 

• B方

   MS                                                               Network 

                                    FACILITY 

     <----------------------------------------------------------------------- 

                   Facility (Invoke = NotifySS (CFNRy, SS-Notification)) 

• C方

   MS                                                                  Network 

                                            SETUP 

      < ------------------------------------------------------------------- 

       Facility (Invoke = NotifySS (CFNRc, SS-Notification))Redirecting party BCD number (screening indicator, presentation indicator, redirecting party digits) 

CFNRc 用户不可达呼叫转移

• A方流程

   MS                                                                   Network 

                                            SETUP 

       -----------------------------------------------------------------------> 

                                           FACILITY 

      <------------------------------------------------------------------------- 

                         Facility (Invoke = NotifySS (CFNRc, SS-Notification)) 

• B方 没有动作；
• C方

   MS                                                           Network 

                                   SETUP 

      < ---------------------------------------------------------------- 

       Facility (Invoke = NotifySS (CFNRc, SS-Notification))Redirecting party BCD number (screening indicator, presentation indicator, redirecting party digits) 

设置呼叫转移

MS                                                                        Network

REGISTER

------------------------------------------------------------------------>

Facility (Invoke = ActivateSS (呼叫转移类型, BasicServiceCode))

RELEASE COMPLETE

<-----------------------------------------------------------------------

Facility (Return result = DeactivateSS (SS-Status))

注册失败情况：从网络发以下请求中其中一种：

RELEASE COMPLETE

<- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ----

Facility (Return error (Error))

RELEASE COMPLETE

<- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Facility (Reject (Invoke_problem))

取消呼叫转移

MS                                                                      Network

REGISTER

--------------------------------------------------------------------------->

Facility (Invoke = DeactivateSS (呼叫转移类型, BasicServiceCode))

RELEASE COMPLETE

<---------------------------------------------------------------------------

Facility (Return result = DeactivateSS (SS-Status))

取消呼叫转移失败情况：从网络发以下请求中其中一种：

RELEASE COMPLETE

<- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Facility (Return error (Error))

RELEASE COMPLETE

<- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Facility (Reject (Invoke_problem))

呼叫转移代码实现

呼叫转移界面显示实现

主要在callnotifer.java中getSuppSvcNotificationText()；主要实现了若用户设置好呼叫转移后，发生呼叫转移时以toast形式提示给用户。
主要分下面2个方面（A 打电话给B，B设置呼叫转移到C；）

• 呼出MO
  • MO_CODE_UNCONDITIONAL_CF_ACTIVE/MO_CODE_SOME_CF_ACTIVE: B激活了呼叫转移功能，若B拨打电话出去时，当modem侧上报Alerting消息里包含了faclity的消息，根据B设置的callforwarding的条件，显示给用户；
  • MO_CODE_CALL_FORWARDED: A拨打电话给B，呼叫转移给C，接收到网络端发过来的facility消息，在用户A上显示此电话是一个呼叫转移call；
• 呼入MT
  • MT_CODE_FORWARDED_CALL：用户C接到呼叫转移过来的call，接收到网络端发过来的facility消息，在用户C上显示这是一个呼叫转移call；
  • MT_CODE_ADDITIONAL_CALL_FORWARDED：当用户B设置为CFB 或是 CFNRy ，若发生了呼叫转移，接收到网络端发过来的facility消息，在用户B上显示该call已呼叫转移；（CFNRy 没有确定）

SETUP消息中包含facility消息表明此为一个forwarding call

• cmcall.c
  • cmcall_rpt_proc（） 底层上报facility消息到CM侧；
  • cmwcall_rpt_call()
    • 根据cm_rpt_ptr->hdr.cmd ，case：CM_MT_CALL_SS_IND 处理；
    • 若是一个forwarding call，则通知上层，消息为：CM_CALL_EVENT_CALL_BEING_FORWARDED
• qmi_voice_cm_if.h
  • 把底层上报的消息修改为qmi侧能识别的消息；CM_CALL_EVENT_CALL_BEING_FORWARDED--->QMI_VOICE_CM_IF_EVT_CALL_BEING_FORWARDED
  • qmi_voice_cm_if_fill_and_send_sups_notification_ind()对该消息进行处理；
    • 赋值notify_type然后调用qmi_voice_cm_if_unsol_response（）；header=QMI_VOICE_CM_IF_CMD_SUPS_NOTIFICATION_IND；
  • qmi_voice_cm_if_unsol_response（）对header=QMI_VOICE_CM_IF_CMD_SUPS_NOTIFICATION_IND
    • 再一次进行那个赋值
    • dcc_send_cmd(DCC_QMI_VOICE_CMD, data_ptr);
• DCC_QMI_VOICE_CMD的情况由qmi_voice_process_cmd()处理
• qmi_voice.c
  • qmi_voice_process_cmd() header:QMI_VOICE_CM_IF_CMD_SUPS_NOTIFICATION_IND;
  • qmi_voicei_sups_notification_ind()
  • qmi_svc_send_ind(xx,xx,VOICEI_CMD_VAL_SUPS_NOTIFICATION_IND【0x0032】,ind),上报到qcril侧；
• voice_service_v02.h
  • QMI_VOICE_SUPS_NOTIFICATION_IND_V02 0x0032
• qcril_qmi_voice.c
  • qcril_qmi_voice_unsol_ind_cb_helper()
    • case:QMI_VOICE_SUPS_NOTIFICATION_IND_V02 --->qcril_qmi_voice_sups_notification_ind_hdlr()
  • qcril_qmi_voice_sups_notification_ind_hdlr()
    • 根据notification_type进行处理。若来电时forwarding call，符合case：NOTIFICATION_TYPE_INCOMING_FORWARDED_CALL_V02；则标明此为forwarding call；上报给RIL侧；
    • 上报消息RIL_UNSOL_SUPP_SVC_NOTIFICATION；该上报没有标明这是什么条件的呼叫转移，只是说明此为一个呼叫转移的电话。

SETUP消息中没有facility消息但包含redirecting number的forwarding call

• DOCOMO运营商若来电是一个forwarding call不会再SETUP消息中的facility消息中表明此为一个什么条件的forwarding call，而是直接在IEI消息中包含了设置方的号码；
• 下图是来电的流程图；