C# + TAPI - Answer detection problem

Hi, I'm writing a C# program that uses TAPI to make a telephone call. Setps: 1 - Call a specified number. [OK] 2 - Wait for answer or busy signal. [PROBLEM] 3 - Play a wav file. [OK] 4 - Hang up. The problem is in step 2. It can't detect whether someone answered the phone or the line was busy. Please see attach project. Only need fix that BUG!!

## Deliverables

1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.

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## Platform

Windows / C#

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