Check your Timeslots for Local/Remote Out of Service messages. It may also be that two timeslots are mapped [Timeslot Mapping and Blocking] to one Modem or something of that nature. -----Original Message----- From: usr-tc-bounces+adam=semo.net@mailman.xmission.com [mailto:usr-tc-bounces+adam=semo.net@mailman.xmission.com] On Behalf Of Shahrooz Sharghi Sent: Tuesday, July 26, 2005 12:26 PM To: Discussion relating to the 3Com/US Robotics Total Control modemsystems. Subject: [USR-TC] Hiper DSP Hi all We have a tc1000 with this configuration: 1- NMC Card 2- Hiper Access router card 3- 1 E1 DSP ISDN Signaling Max users could connect to it are 29, never we don't have 30 online user together. After 29 online user they get Busy Tone. What do you think about this problem? Regards Shahrooz Sharghi