Hi guys, I found that the RTP ports couldn't be adjusted in 3CX V15.5 SP2. Changing RTP ports is very easy in other systems. Why is it blocked in 3CX or did I miss anything? We are going to provide VOIP service to our client. But we only have one public IP for VOIP service, if we have two or more PBX behind the firewall, then the port range is conflict. Any idea?