I worked for a telcom firm in Sweden and we used the solutions from www.teligent.co.uk to handle refills on phone cards (and a few other services). Parts of their solution were based on FreeBSD. But they used SCO/unix as phoneline-handler as there were only drivers for the card in SCO. Even though this might have changed as I write this. (I know they were trying to get away from SCO and getting everything over to FreeBSD when I was working with it.)
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I worked for a telcom firm in Sweden and we used the solutions from www.teligent.co.uk to handle refills on phone cards (and a few other services). Parts of their solution were based on FreeBSD. But they used SCO/unix as phoneline-handler as there were only drivers for the card in SCO. Even though this might have changed as I write this. (I know they were trying to get away from SCO and getting everything over to FreeBSD when I was working with it.)