If you are using the starface telephone system and the app (http://www.starface.de/de/Solutions/integration/macclient.php) this workflow might be interesting for you.
It initiates calls from your contacts phone numbers, or just any number you type in.
Usage
You can call any number just by typing:
call +4930123456
Or you can find a contact and select one of its phone numbers.
Download, Informations and configuration guide on Github: https://github.com/robinboening/alfredapp-starface