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Sonicwall IPS Detection Alert: ICMP Destination Unreachable (Port Unreachable)

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Hey guys. Need a quick help here. Im getting these alert on my SW:

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IPS Detection Alert: ICMP Destination Unreachable (Port Unreachable), SID: 310, Priority: Low Source: 64.254.145.204, 60365, X1 Destination: 192.168.0.84, 56761, X0 

As per my phone log:

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;reg-id=1;+sip.instance="";audio;mobility="fixed";duplex="full";description="snom870";actor="principal";events="dialog";methods="INVITE,ACK,CANCEL,BYE,REFER,OPTIONS,NOTIFY,SUBSCRIBE,PRACK,MESSAGE,INFO" (udp:209.52.***.***15250) 


It seems that these alerts are just for my VOIP phone IPs. and today inoticed that these lines are dropping or cutting during the call. Could it be the case and how to fix it?


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