I've come into possession of 3 ISDN controller cards. I know we paid a fair amount for them originally but I'm wondering if they're still worth anything or shall I just bin them?
Few pics of cards
Example of prices when sold
https://www.voipango.com/en/voip-gatewa ... -2605.html
https://shop.gerdes-ag.de/primux/primux ... __store=en