How to make Excel Dial Pro work?

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Hello,

I have been trying to make Excel Dial Pro work but every time I double click on the number (on the excel spreadsheet) it just dials the number but the phone call does not reaches out. It does dial the number, and I can hear the tones when dialing but then stops there. The buttons ask me to disconnect when finished but there is no phone call actually made. Can you please help?