Okay - I have done some more research. I cleared all of the logs this morning and re-checked the Sys logs in the afternoon and here is what I have found: EVT: 263-203 S8 (11:47), EVT: 263-204 S8 (11:48), EVT: 264-203 S1 (13:02), EVT: 263-203 S8 (13:17), EVT: 263-201 S8 (14:41), EVT: 264-201 S1 (14:31). I know that the EVT: 263-XXX S8 is "the ICS takes the E&M line on port XXX out of service because the far end did not respond to a disconnect signal." (from installers manual) and that the EVT: 264-XXX S1 is "The E&M line on port XXX is returned to service after the far end finally responded to a disconnect signal." This may be simple, but I am trying to determine what causes this. Is it the phone system or is it the Telco T-1 service? I think what is happening is that over time the system is taking several of the lines out of service resulting in my having to restart the system. Any help would be appreciated. Thanks