[App_rpt-users] How to determine which node is transmitting to the hub node

Is there any way to look at some log file to determine which node is transmitting to a hub node? How can I determine which of the many nodes connected to the hub nodes has a stuck transmitter? How can I determine which node is broken so I can disconnect it from the hub node? Is there some type of IAX2 Packet that I can look for that indicates transmit? Has anyone found a solution to this issue? Thanks, Jim WA1SOT