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kumar1 asked ·

I sometime receive call from 4 digit number but I am never able to receive those calls.

I sometime receive call from 4 digit number but I am never able to receive those calls. I am not sure which device the caller is calling from may be Skype but it is unpick-able.
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kim answered ·
This is usually a  SIP Vicious attack. Please have your IT Dept check your router configurations . 
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