Hoping someone can help.... Having a problem with a Total Control system and a Dual PRI card. The problem is that the PRI will fluctuate in and out of service. Sometimes it will stay up for days and other times if will go up and down many times over the course of a day. When its down, both the CD and Alarm light are red and I get a slow busy if I dial into it. The PRI is from a Verizon 5ESS switch using ESF framing and B8ZS line encoding. Verizon has run numerous tests and continues to claim the circuit is fine, counting no errors. PRI Card Info: Operational Status operational Serial Number BB673L8J Hardware Revision 4.0.0 Software Version 3.1.5 DIP Switch Settings 0 DRAM Installed (KB) 4096 ROM Installed (KB) 1024 PRI Congiruation: Line A Timing Source high Line B Timing Source mediumHigh Internal Timing Source notAllowed ISDN-GW Slot 16 Analog Modem Calls enable Modem call routing method roundRobin Set DS0 Out of Service upon NAC Removal disable INFO Message Timeout 20 DNIS Length 10 Select PCM Companding ulaw Span Line Configuration: Framing Mode ds1ESF Line Coding Options b8zs Response to Remote Loopback ignore Jitter Attenuation attenJitterOnTxmtr Transmitter Attenuation dB0 Primary Switch Type Set priSw5ESS Idle Byte Pattern 254 Call Proceeding/Connect on SETUP Message on ALERTING Response on SETUP Message off Overlap RX Mode disable Here's the inventory from the chassis: U.S. Robotics 17-Slot Chassis with PB clocking USRDevice3 <204.250.119.3> 1 3COM PRI-T1/E1 NAC BB673L8J 0NJ 4.0.0 4096 1024 0000000000000000 3.1.5 2 3COM Quad V.34 Digital Modem NAC B7B7ECHX 08U000 3.0.0 0 0 0000000110001000 6.1.86 3 3COM Quad V.34 Digital Modem NAC B6E78X7X 08U000 3.0.0 0 0 0000000110001000 6.1.6 4 3COM Quad V.34 Digital Modem NAC B6G79HSX 08U000 3.0.0 0 0 0000000110001000 6.1.6 5 3COM Quad V.34 Digital Modem NAC B827IVHU 08U000 3.0.0 0 0 0000000110001000 6.1.6 6 3COM Quad V.34 Digital Modem NAC B2Q8KLZC 08U000 3.0.0 0 0 0000000000001000 6.1.6 7 3COM Quad V.34 Digital Modem NAC BC16SP22 19U000 2.0.0 0 0 0000000100001000 6.1.86 8 3COM Quad V.34 Digital Modem NAC B877K1N0 08U000 3.0.0 0 0 0000000010010100 6.1.6 9 3COM Quad V.34 Digital Modem NAC B877K1JR 08U000 3.0.0 0 0 0000000010010100 6.1.6 10 3COM Quad V.34 Digital Modem NAC B877K1PP 08U000 3.0.0 0 0 0000000010010100 6.1.6 11 3COM Quad V.34 Digital Modem NAC B877K1JC 08U000 3.0.0 0 0 0000000010010100 6.1.6 12 3COM Quad V.34 Digital Modem NAC B867JUQG 08U000 3.0.0 0 0 0000000010010100 6.1.6 16 3COM NETServer NAC B8D657J6 0DO000 7.0.0 20480 2048 0000000000000000 3.8.1 17 3COM Network Management Card with clock B8E7LKQF 1UR00000 6.0 16384 8192 0000000000100000 5.5.5 1 3COM Bellcore Approved Long Haul Dual T1 NIC 4096 1024 0000000000000000 17 3COM Ethernet NIC ???????? ?? 0 0 0000000000000000