title: How mobile OS talks to baseband OS
body: <p>I am trying to modify the mobile OS, so that I can control which call to take, and which one to reject, and also to run some signal processing.</p>
  
  <p>I am playing with Android OS, but I need to talk to baseband OS, and I am sure there is some way as whenever we get a phone call, the mobile OS user interface comes to life, and whether we want to take or reject the call - this decision can be taken at mobile OS layer, which then gets transmitted to baseband OS!</p>
  
  <p>I have tried to find in Google, but can not find a thing, on what kind of interface exists between baseband OS and mobile OS. </p>
  
  <p>Help would be greatly appreciated!</p>