Phones are calling themselves

Our phones are randomly calling themselves. Occasionally my users will receive a call from their extension that rings their phone. Once they pick it up, nobody is on the line. This happened today and all of the phones rang their respective extension.

I cannot figure out what might cause this. Has anybody experienced it? Can anybody help me with troubleshooting?

We are running FreePBX with Polycom phones.

Thank you

You are getting hacked, don’t open your server to the Internet

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Those calls are sent directly to your SIP device’s IP address, from automated scanning tools, by hackers looking for PBX systems to break into. Disable IP to IP calling on your phone/ATA or change the local SIP port.

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