which auto dialer to use in voip

I am trying to set up a autodialer using a Zoom voice modem from my work station to make calls to my voip deployments at remote locations.Can someone suggest a good auto dialer to buy.Also my remote location is having an answering machine there.Is there anyway that when i make a call,the answering machine detects it and send back some kind of sound back to me to confirm that it has received my call and if it doesn't it has to send me an email.....Do i need to install any software on the answering machine to do that??? Any help and suggestions would be greatly appreciated. Thanks

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manil
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