RRC uses 5 ports, telnet, web, SIP, UDP CMD, UDP AUDIO.
Only SIP, UDP CMD and UDP AUDIO is needed for remote control.
I never open/forward webserver/telnet port to internet. And I can work with without problem, I dont have PC client.
If I need change something in my radioside config then anyway I need some PC/notebook for this and
then vpn/ssh tunnel for this is no problem.