Douglas,
I believe this is determined by a sub-function in detecting signaling coming same host / different ports (originally designed for Localhost activity, controlled by CFLOW_HPORT parameter when set to 1(on) or 2(auto) ) and forcing CFLOW to display unique entries for each by using IP:PORT format.
Have you tried generating the same callflow scenario with the CFLOW_HPORT parameter set to "0"?
Best,
Lorenzo Mangani
QXIP - Network Engineering
When registrar is replying to proxy REGISTER message, call flow diagram shows response coming from what appears as a different server. See attached. Also attached are my configs. Is there any way to make it look like reply is coming from same service?