Hello, I just upgraded our system from v9 to v10 and applied the latest patch. One of the new features I was very interested in was the IP Blacklist feature. I have a list of seven public IP addresses I gleaned from using Wireshark that were trying to hack into my system via port 5060. All but one of them were from overseas. Here is the rub: Whenever I enter any of the IP addresses in the IP Blacklist under SETTINGS>ADVANCED using the single IP address entry field, within a minute my VOIP providers unregister AND all of my phones as well as the system extensions unregister. I remove the entries and they come back to life. I checked the server entry log and it discloses a packet from 192.168.x.x (one of my extensions) was blocked from Hacker 1 (the entry I placed in the remarks section of the blacklisted IP address). Yet the blacklisted-IP address is a public IP address and not even close to my internal IP addresses. Any ideas what may be going on?