SIM1
  status  
 | 
  
SIM2
  event 
 | 
  
SIM2
  action 
 | 
 
Active call on Wi-Fi (VoWiFi) 
 | 
  
Receives IMS call (SIP INVITE) over Wi-Fi 
 | 
  
Rejects call with 486 – Busy here 
 | 
 
Active call on Wi-Fi (VoWiFi) 
 | 
  
Receives IMS call (SIP INVITE) over LTE 
 | 
  
Rejects call with 486 – Busy here 
 | 
 
Active call on Wi-Fi (VoWiFi) 
 | 
  
Receives SMS/MMS on either SIM1 or SIM2 
 | 
  
SMS/MMS is accepted/received on
  corresponding SUB 
 | 
 
Active call on Wi-Fi (VoWiFi) 
 | 
  
Receives CSFB call over LTE on either
  SIM1 or SIM2 
 | 
  
Drops CS page/call in LTE 
 | 
 
Active call on Wi-Fi (VoWiFi) 
 | 
  
Receives CS call on GSM/WCDMA on either
  SIM1 or SIM2 
 | 
  
Drops CS page in GSM/WCDMA 
 | 
 
Active call on LTE (VoLTE) 
 | 
  
Receives IMS call (SIP INVITE) over Wi-Fi 
 | 
  
Rejects call with 486 – Busy here 
 | 
 
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