SIP Attack

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Every 3 to 5 minutes I am receiving a call that is not being recorded on the ring central server.  It is even a blocked number.   It usually comes in as 8889207896.  Earlier in the day I think it cam in as SIP vicious 101 

I believe this may be what is called a SIP attach directly to my Polycom vvx 201.  

Does anyone have a resolution for this type of problem.  Ringcentral support had no solution and my ISP had no solution.  Is there a way to block this fake call inside the polycom phone? 
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Greg

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Posted 5 months ago

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Jessica - Community Moderator, Official Rep

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Hi Greg, 

Check out this KB article on how to lock down the SIP ports on the router. 
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Greg

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Thanks Jessica.  I saw that one earlier but my phone is not going through my router. 
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Brandon, Champion

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It’s sounds like your phone is exposed to direct inbound internet connections. That is dangerous and you need to get the phone behind a firewall or at the very least behind your providers router/modem without any inbound ports open to the phone(s).