Detect when the remote user answers the call

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What steps will reproduce the problem?
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What is the expected output? What do you see instead?
I am trying to charge for outgoing phone calls but I cannot determine when the 
outbound call gets answered.  Is there a way to do this or should I focus on 
spinning my own way?  Originally I thought EStateId enum would do the trick but 
that does not appear to be the case.

What version of the product are you using? On what operating system?
Latest build

Please provide any additional information below.

Original issue reported on code.google.com by tkcdr...@gmail.com on 29 Dec 2011 at 4:50