voip.co.uk provide free landline calls after 6pm, but you'll have to work hard to get them sign you up unless you're a business - they are not taking new residential subscriptions (or weren't last time I looked!)
and 1899.com from a BT line = free landline calls and cheap connections - but you need to ring it and then dial the onward number, so can't directly bridge over VoIP (unless you can get something to play DTMF once you connect!)
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