[cisco-voip] Cisco IP Communicator Time&Data

[Roby]

Hi.
I have the following problem.

Within a cluster of eight CUCM 7.1(3), I have several phones (IP Communicator 7.0.4) behind a firewall. These phones are registered with CUCM, and are configured correctly (device pool with Date/Time group Information).

But if I change the time pc, also changes the time of the phone: this is not correct, right? What could be the problem? Ports to open on the firewall? Can you help me, please?

Thanks a lot.
Best regards,
Bob