[android-developers] How to get precise call state?

Hello.

I'm trying to write an organizer, and one of it's tasks is to account
phone calls and to manage reminders of planned calls. So I need to
determine if call was really succeeded and how long it was - for
example, if called side was busy, it must remind later to call second
time.
In public API I found only
android.telephony.TelephonyManager.getCallState - but is seems that it
is unable to supply me with statuses DIALING, ANSWERED and BUSY. Is
there any way to get precise status of current call?

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