I have upgraded the kit to a TDA200 and the error message is now appearing on this system!?!

So I assume that means trying new cards as I just used the existing cards: 2x DHLC8, 1x BRI4, 1x CSI/F

Last time I was at the site the customer explained a new issue - on Night mode all phones are set to ring but alot of the users are complaining that incoming calls are dropping once they answer. Would this point to the ISDN card?

Any thoughts?

Thanks