voip business

For text chat Skype is a good choice.
For PC to phone calls a voip provider like voip.com is a better choice.
(Review of other voip providers)

You'll get a internet phone adapter to plug into your router.
Than plug your analog telephone into this adapter and you're ready to receive calls after installing a SoftPhone you'll also get from.
That's all to call from your computer to a phone.

When you install the SoftPhone onto an iPhone you can connect it anywhere to another PC withoud downloading software and installing it to make calls.

You can check if your VoiP Speed is good enough for good quality voice calls.