Hi,

I am developing an VoIP app. 

   1. My app registers to a SIP based back-end server using a User-ID and 
   password. 
   2. Once the registration is successful, the user can make sip calls 
   through this app.
   3. If the user uses the native phone dialer to dial out a number, My app 
   intercepts the call and places the call through SIP.
   4. Once the call is intercepted, the native phone dialer goes to 
   background and my app's 'call status' screen is displayed(my app comes to 
   foreground).

My requirements are as follows:

Once the call is intercepted, instead of showing my app's UI, We need to 
display the native dialer(default phone dialer) 'call status' / 'call 
progress' screen(like Samsung's Touchwiz for Samsung phones, HTC Sense for 
HTC phones etc), but the call should go through my app(SIP). Our app should 
take control over all the functionality of the native dialer 'call status' 
screen.

Eg: If the user taps the 'Call End' button on the 'Call Status' screen of 
the native dialer, my app should end the call. Similarly all the controls 
on the 'Call Status' screen of the native dialer should handover control to 
my app to take the necessary action.

Please let me know whether it is possible to accomplish this. If it is 
possible how to implement this?
Please reply ASAP, Thanks in advance.

  

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