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Are you sure your DNS is correctly configured to reflect any new IP's and names? I had this problem but as soon as we corrected our DNS the problem disappeared, the workaround would be to enter IP address in the parameters instead of hostnames but it...
AlsoI have seen this in the uk where a 2 wire crossed cable was used and it acted as a conference, whatever one said everyone else using that gateway could also hear.
I have a great paper written by the Cisco business unit that tells exactly how to secure call managers, I don't want to give out the email address of a cisco employee on this forum though, but through your SE you should be able to get the same thing,...
