In Asterisk-Java, how do you handle multiple call transactions in AgiServer class wherein it has a single port of 4573?
TCP sockets 101.
source IP:Port + destination IP:Port = socket identification
the underlying OS and TCP stack will ensure the higher level streams only get the pertinent information to that particular socket connection.
Can I run multiple DefaultAgiServer at the same time without conflicts on ports?
you shouldn’t need to… to what end would you want to run multiple AGI servers?
I think that should not be. 
Just wonder how can I send back to other java class the value of getData.