Linphone Ghost Calls
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Not sure if you have the same issue, but I had this problem on our PBX server when I was using Trixbox. It was annoying that the front desk phone rings like 50 times a day and after logging a ticket with Trixbox they said its a hacking attempt due to the ports opened for remote sip phones for my branch offices. One advice from them was to only whitelist the branch office IP and check, that didn't really helped much.
I setup fail2ban which even though was not supported by trixbox, after installing that and some trial and errors, the ghost calls stopped. Then we got migrated to our parent PBX server, so its not my headache anymore!
