android - Programmatically detect when outgoing call starts ringback tone (ringing to the other person) -

android - Programmatically detect when outgoing call starts ringback tone (ringing to the other person) -

i want know how observe in android when outgoing phone call acceptable (but not yet accepted) other person , receive ringback tone.

i tried phonestatelistener using method oncallstatechanged(int state, string callingnumber), state returns me 2 (starts) , 0 (ends) , not when phone call acceptable other person (there time between starts phone call , other phone receive phone call , starts ring)

there android method know or do?

android detect phonecalls