Voice over IP voice messages can be seen and overheard by wireshark
a user put wireshark onto a voice port and was able to record other users voice mails. We are thinking about using port security to stop this but I think that spoofing the mac address of the phone would be to easy. I am not sure where a broadcast or multicast would take place for a user leaving a message. Is Call Manager involved, Unity or Exchange. Is there a way to make sure that all of the voice transmissions are unicast packets. Any help would be greatly appreciated because we would like to take the necessary precautions to avoid this at all cost.
I hope this helps you to take a step in the right direction to secure your VOIP network.
If you enforce this, the user cannot access the voice vlan in the first place, left alone listen to multicast/broadcast voice mails (which I doubt happened in the first place anyway). He most probably used one of the above techniques to capture the 'unicast' VOIP traffic.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...