Welcome to the forum Andrea.
Fear not, your solution is indeed very simple.
Id like to get rid of my BT line at home, but unfortunately am stuck with it as i use ADSL.
Lets start with your VoIP provider first. There are a few decent ones floating about. My rule of thumb is don’t ever use a company who you cant get in touch with. Look for one with a support number for when their service goes down, and one that will respond to your enquiries. There is nothing worse than being ignored. Do away with VoIP Stunt.
I would recommend voipfone. If you tell me what the area code for Dundee is I’ll check for availability. My guess is they will have it. Their service has many handy functions, and are continually developing. A local number will cost you £2 a month.
So your signed up, now you need something to talk on. You have two options. 1. Buy a dedicated VoIP specific handset. OR 2. Use and existing "old style" handset, and add a converter/ATA - analogue telephone adapter. You can pick up an ATA for about £30, so I’d go with that. All it does is enables your old retro phone for use with this new fangled VoIP. A common ATA people use is this one -
http://ukvoiptalk.com/reviews/showpr...oduct/4/cat/14
Once you have those two things set up, it can handle all you’re looking for.
Hope this helps.
Matt