Easy fix don't allow voicemail to answer, send all voicemail traffic manually and get a answering machine for after hour traffic. Still, this isn't bulletproof. If your looking for better security then your current equipment can provide your out of luck. I suggest for future insight that you check into the equipment that has been donated before you install it. It definitly is worth a service call to find out exactly what you are getting yourself into. But finger pointing and blame shouldn't bee done here. Give AVAYA a call and express your rage to them.
