You should be able to do this via AppleScript within a FMP script. We do this with ABDialer and it works great.
I wrote a script to dial Skype a long time ago which I use daily in my practice to dial from a field. I wrote a technical document on it. Search in documents for the tag 'ron smith md' and you'll be able to find it. Probably you can cannibalize it with little effort!
Ron Smith, MD, 'The Pediatric Guide For Parents'
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Forever And A Day For Laura Michelle