Make and receive calls via computer connected by landline

Dunno you're gonna find anything that makes you happy. I fussed around with dialup VOIP several years ago, came away pretty disgusted. The problem is bandwidth, period. Years ago, there were some 56K Voice Modems which claimed VOIP capability, but results - actual results - were unacceptable; I tried several, found nothing that worked as I wanted it to, even with voice modems that incorporated their own sound cards or integrated with your machine's sound card. The brand names AOpen and US Robotics come to mind. At one point, I had a shotgun setup that used an outboard appliance from 3Com that was 4 modems in one box, more or less, connecting via 4 individual phone lines to 4 synchronized dialup accounts (a protocol known as "multilink") - brought effective download speed into ISDN range, around 100-128 kbps, upload to around 60-80kbps - there was special proprietary VOIP/VPN software, and even with that it honestly was unusable for VOIP - the voice quality varied from pretty poor through merely terrible to downright unintelligible, usually all within the same call attempt.

Thanks for the info timberlandko. The reason I would choose landline over VoIP is I will be using it for my business and my internet stops working frequently which would make the phone not work.

Is there any good software that will enable me to make and receive calls via VoIP?

Thanks again,
Mike

Don't matter what you wanna use it for, or why - you're talking about VOIP if you're talking about using your internet connection to make regular phone calls, and VOIP just ain't gonna work over dialup. If dialup is your only option, and you want your 'puter to be online via phoneline while you make and receive phone calls, you're looking at a second phoneline - one for data, one for voice.