Can I iniate phone calls from my Mac?

On my Microsoft PC with Excel (Works actually), I used to be able click on a cell to make a call. This was very useful if I was making a lot of calls to busy people. When a the phone call was answered, I could see to whom I was talking, with useful information (reason for call/ history/ colleagues' names...).

I now have Excel (Office for Mac 2011) and would like any system linked to that.

Thanks in advance, raybry