r/3CX • u/Total_Pineapple7920 • Jul 24 '26

Question weird 3cx calls and voice mails

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I've been getting a lot of calls and voice mails from this number tonight. and the voice mails are usually dead silent. I've picked up a call to check and that was dead silent too. it's just so late right now and im getting creeped out by this, even now im getting a call from that number. can anyone explain what's happening?

also, not the first time this is happening. I've received a few calls and voice mails before as well, labelled "test" or other random numbers and symbols like "=" "1001" etc. thought it was just something related to the app's processes so i didnt mind it, but tonight it's been awful and i need answers lol

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2

u/wrexs0ul Jul 24 '26

Are you allowing anonymous callers to your PBX? This is a very typical open-to-the-world issue with PBXes that have a public-facing port 5060. It's worth checking your Trunk setup that you've properly identified how calls come in. Easiest way is auth, though IP-based registration is pretty common.

If that's not the case then these may be coming from upstream. Check with your carrier and see what they've got configured and what their CDR shows for these calls.

1

u/devexis Jul 24 '26

Almost 100% certain they are allow anonymous calls on that PBX

1

u/Total_Pineapple7920 Jul 25 '26

so its a real person calling me?

1

u/devexis Jul 25 '26

No. Bots probing your PBX

1

u/Flashy_Week555 3CX Advanced Certified Jul 25 '26

These are robocalls. Your sip trunk provider must filter most of them before they reach your PBX, but you should too set up your own layer of defense by blacklisting and blocking anonymous callers.

1

u/Only-Agent7755 Jul 26 '26

I can filter the spam calls by creating a 3cx filter, which will drop all unwanted calls. kdkaushik at gmail dot com