Why does the port range 16384-32767 (RTP media) need to be opened up for Genesys Cloud Voice/BYOC Cloud?

This port range only needs to be opened for outbound connections. Genesys Cloud needs access to all of the ports in this range to ensure that the number of possible simultaneous media streams is sufficient. If these ports are not open for outbound connections, then any media that uses RTP may be intermittent or completely unavailable.