We have a 3825 with two PRI's terminated on it, that is the voice gateway to the PSTN for about 50 clients (200+ phones). They use varying systems including routers with FXS cards (and analog phones), CME, and SIP voice. Ocationally when someone is trying to call a customer they get a message "all circuits buys" Then they try again a few times and the call goes through.
Are there any logs I can setup on my gateway to determine if we are maxing out on channels at times, which would give this message to the people calling in?
Any thing eles I can check to determine if this issue is mine or the Telco's?