The basic fields and their descriptions are listed in the documentation to Call Flow 1.0 here
To get the precise list of fields use:
...
| Code Block | ||||
|---|---|---|---|---|
| ||||
tcpdump udp port 9091 tcpdump tcp port 8081 -i lo -s 4096 -w log.pcap |
...
This command records traffic that is sent to and received on the port 90918081. Later, you can view results in Wireshark and see how the fields are sent exactly.