I would like to use my landline (home phone) with the iMac and be able to use my contacts to dial up their phone number, I also would like to receive calls as well.
Please advise me of what hardware and software do I need
thanks
I don't think you can use the Mac for "handsfree" conversations when on a traditional landline. A VOIP home phone service usually can be set up via an app such as "Telephone".
With a traditional landline, you can set up a USB modem to dial from your computer but you'll have to speak and listen through an actual telephone.