Poor Answering Machine detection.

I am currently running the following;

Avaya Pbx


software version  8.04.0.046.0

Call Classifier version  TN 744D (Vintage 000 004)

Genesys CTI


TServer  v6.5.306.01

OCServer  v6.5.100.25b

1.We have Answer Machine Detection switched ON, We want to drop all calls when an AM is detected by the Call Classifier at the Avaya Pbx.

2.We ONLY want agents to handle calls which are “answered by customers”.

3.In our test, Genesys is dialling a calling list with 250 records. We get 50% of calls successfully detected as AMs and the remaining 50% get detected as answered by “customer”. A 50% success rate is a poor return.

Is there any one who has encountered a similar problem? If so how did you go about resolving this?