Sametime udp ports firewall

A short question about Sametime 11/12 and its using udp ports for audio/video.

We do have Sametime 11/12 running complete internally (on kubernetes), so we deactivated the STUN servers (entry jvbStunServer: "").

We now need to create a firewall rule to allow audio/video for other locations.

I know that a/v on kubernetes uses udp 30.000+ (docker 10.000), but the question is, if i only need to accept incoming or incoming&outgoing (bidirectional) for a/v to work.

Thank you

It needs to be bidirectional.