I can hear callers leaving messages via my speaker phone.

"Genius Bar" at Apple Store; make appt.

The KX-T7453 isn't a voicemail system. Please refer to the documentation for whatever voicemail system you have connected.

Making Use of the Voice Mail Service
From your own extension
VPS* Extension No.
Mailbox
· If you have no password, you can skip the last step.
* VPS: Voice Processing System
From someone else's extension
VPS Extension No.
Mailbox No.
Mailbox Password*1 +
· If you have no password, you can skip the last step.
Listening to a Message
Password*1
+
KX-TVA series
Listen to Message
Deliver Message
Mailbox Management
Automated Attendant
Message Notification
Other Features
End Call
KX-TVS series
Listen to Message
Deliver Message
Check Mailbox Distribution
Automated Attendant
Mailbox Management
Other Features
End Call
VPS Extension No.
Leaving a Message
From your own extension
Mailbox Password*1 +
From someone else's extension
Mailbox No.
Mailbox Password*1 +
· If you have no password, you can skip the last step.
Enter the desired mailbox no.
To send the message immediately
Leave a message
(KX-TVA series)
(KX-TVS series)
Follow the guidance
To set the delivery time

1.goto phone menu.
2.goto setting.
3.goto callsetting.
4.goto divert call to voice mail

I don't think the voice mail is going bad.

On my 4424D+, I can turn off voice mail.
I use this feature when I'm gone for an extended period of time so I don't come back to 100 VMs.

Dial into your voice mail.
Choose the prompt for Call Answer Mode. (Option 8 on my phone.)
Then choose the prompt for Record Mode. (Option 1 for me.) This allows callers to record voice mails on your line.

Could be two things, there could be a general delivery mailbox attached to the system which is mail box 100, or the new service provider has a off premisis voicemail attached to the lines. if there is VM on the lines you should get a stuttered dial tone on the line indicating that you have a voice mail.

Thanks for the opportunity to help with your problem. If you also have voice mail through your phone service provider, it's possible that while you are on the phone, the incoming call is "waiting" (meaning you are hearing a beep while you are still talking assuming you have call waiting). If you don't pick up the incoming call, your caller will hear your "voice mail" message and leave a message. However, your answering machine will not indicate that you have a message.

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Just need to power off and on the system.

How did you program the voicemail so a caller can not leave a voicemail to a particular extension? Line ownership? SO a call goes directly to a milbox?

How can you reprogram the voice message????? Which one, for a particular user or the main Auto attendant greeting????

You have to know the admin login to change a mailbox password.

For that, you need to know which voicemail system this is.
When you log in to check your mail, the lady says, "welcome to Partner......"

Please fill in the blanks.