(usr-tc) Problem of connection

I have a TOTAL CONTROL with 24 modems on the slots "QUAD V.34 ANGL/DIG MODEM" US ROBOTICS. I get more than 200 customers. The problem is that I get some customers wich can't connect to this components. When the connection is established, 35 seconds later, th e customer is disconnected. I look at the log file and I realise that the cause of disconnection is ERROR 31. I look to documentation. Has anybody already had that problem. I am waiting for your response. Elisee - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.