Other Considerations

It is important that the port number used is unique. Using a firewall’s option to accept any (ephemeral) port may be problematic in a scenario where there are multiple encoders sending out streams
If the firewall at the source is set to allow the source device to use any (ephemeral) port, then outbound port rewriting must be disabled for Rendezvous mode. The port assignment must be static so the SRT participants can meet.
If either the SRT source or destination device is behind a firewall that does not allow outgoing traffic, you will need to configure the firewall to allow outgoing SRT/UDP traffic
There are still occasions where it would be necessary (or better) to manually configure Caller and Listener settings to traverse firewalls at each end. For example, in high security environments that employ “egress filtering”, firewalls are often configured to prevent arbitrary outbound ports from being assigned. An internal address cannot send to a random outbound port. In such cases, both the source and destination devices would be registered at the firewall, which would block everything else.