question

greg12345678 avatar image
greg12345678 asked robert-dela-merced9071 commented

SIP Attack

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?

hardware
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jessica-community-moderator avatar image
jessica-community-moderator answered robert-dela-merced9071 commented
Hi Greg, 

Check out this KB article on how to lock down the SIP ports on the router. 
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In our situation, it is the opposite: our RingCentral phones will make outbound calls every few minutes to a recently dialed number. It will go on for hours until you yank the power off the phone. Has anyone experienced this before? 
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greg12345678 avatar image
greg12345678 answered
Thanks Jessica.  I saw that one earlier but my phone is not going through my router. 
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bjsvec avatar image
bjsvec answered
Its 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).
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robert-dela-merced9071 avatar image
robert-dela-merced9071 answered
In our situation, it is the opposite: our RingCentral phones will make outbound calls every few minutes to a recently dialed number. It will go on for hours until you yank the power off the phone. Has anyone experienced this before? 
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