Martin,
The response for your questions are below.

How are you making the call? I am using TSAPI cstaMakePredictiveCall to make de call.

What messages do you see? After call connection there is no message. The voice mail start the record just after connect the call.

What messages do you expect? That´s the problem. The Call Classifier expect a message, but hear just silence (the voice mail expecting the message) .

Thanks for your help.

I have a problem to detect voice mail. A telecommunication provider not have the initial message after call connect to voice mail. Every call are redirect to agent. How to configure Call classifier to drop silent call??

Thanks