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

[Jim Richardson]

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