I got an e-mail from Voip provider that someone was dialing numbers from my account. At first, I thought that somehow my Voip account was compomised. But then, looking further, I realised that someone was trying to attempt registering to my 3cx server from France (looking at IP addess) and also was trying to register to voip account. I do not know how that could have happened. Now, I blocked IP addresses that were trying to register to my server. I currently do not forward port 5060 on my router (I disabled it). I did this because I think this port was the only way someone could hacked the 3cx server. I still do not know how that could hack the server. Any thoughts?