For a couple of days I have been getting calls at all hours from numbers such as 100 or 150. I try to answer but there is no audio (they might be listening, but not transmitting). These calls don’t show up in my CDR report, only on my Polycom phone logs, which are configured as extensions of my FreePBX. I have attached a photo of the phone’s log.
There are no records of this in my logs either. Well, nothing I could find. Has anyone had this kind of problem? I had to turn off the phones because it wakes me up at 3 am and such.
I’m assuming that your PBX is remote from your Polycom. Your polycom’s have been set to use local port of 5060 thus prompting your firewall to open up port 5060 as well opening yourself up to sip scanners. You need to randomize the polycom’s local ports and when I say that I do not mean the remote port (which would need to be 5060) I mean the LOCAL port.
