You may be vulnerable to a unique type of DoS attack, malicious third parties may call from any phone in the world and DoS you. All they need to do is shout "BOO":
Field Notice: FN - 62121 - CP-7940G and CP-7960G May Reboot if Volume is Set to Maximum
Summary: The IP Phone may reboot if volume is set to maximum, a call is placed to it, and the caller makes a loud noise.
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You may be vulnerable to a unique type of DoS attack, malicious third parties may call from any phone in the world and DoS you. All they need to do is shout "BOO":
Field Notice: FN - 62121 - CP-7940G and CP-7960G May Reboot if Volume is
Set to Maximum
Summary: The IP Phone may reboot if volume is set to maximum, a call is
placed to it, and the caller makes a loud noise.