I have recently been dealing with sip invite method request flood attempt show up not only in my threatsm but also making it impossible to make calls external or external to internal calls because its trying to call a number every 4 seconds and taking all my SIP connections available. Besides blocking it on the firewall and having the ISP deadroute the called or called number is there anything else I should do?
It probably has simply got to a point where the additonal load caused by this flood, and actual line of business calls, have forced you to cross your CCP limit imposed on the trunk. As long as you didn't cross your CCP limit you likely would have never thought to look at the logs to notice the issue in the first place.
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