Hello, I've set up a FusionPBX server, installed everything, opened my ports, and created the extensions, but when I make a call between my two softphone devices (my PC and my phone), it doesn't work properly. When the PC calls the phone, the call drops after 30 seconds. When I try to make a call and hang up without answering, the call ends on one device and remains open on the other. Also, I can't register any IP phones. Could you please help me and explain this to me? I'm a beginner with FusionPBX; I usually use 3CX. Thank you !