Libjingle to work correctly for all users need to specify the address relayserver and three ports: relayUDP, relayTCP, relaySSL.
Starting Relayserver without parameters displays help: "relayserver internal-address external-address"
How many copies relayserver and with what parameters need to run for "correct" work?
Now I use one copy relayserver and one port for all traffic types. Not sure that it is correct.