I am concurrently using v12 and v14. I just downloaded v15.5 for trial purpose. I was trying to change the RTP ports on v15.5 (Linux) since its RTP ports conflicts with my v12's on the same WAN. To my surprise, there is no option for changing RTP port range under v15.5 [Setting -> Network]. Has the option (to change RTP port range) been moved to else where? Or, has it been removed from v15.5 completely? Or, perhaps it was because of the free license that I was trying out? Thanks for helping!