Hello & Welcome to Just Answer,
Sorry you are having trouble with your phones and message systems.
May I ask if you can do a quick TEST for me?
Can you pick up any handset, press the TALK button, and then QUICKLY listen for the dial tone?
It may take a couple of tries, but let me know if you hear:
- A CLEAR and STEADY dial tone
- A few "beeps" - followed by a clear dial tone.
- A few "pulsed" dial tones, followed by a STEADY dial tone.
- something else.
I may have another few questions about this issue for you after this one.