Player trading, follow and player name color

Hello!

Is it possible to allow trade and follow between two characters, which are not from the same faction? I dont find anything. If i want to trade or follow i get a error message, because the faction is not the same.

Is it the Trinity Core or the Client that sets the colour of the player name?

http://www11.pic-upload.de/20.09.15/5b52nr4eqmye.jpg

Thank you for help!

You can allow chat,trading,speack,guilds betwen horde/ally and other stuff in worldserver.conf

If the realm is set to FFA, then the worldserver conf settings dont work.