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What telephone do you have, on your landline?
What voicemail do you have, voicemail from a local answering machine or module or 'box'? or do you have ATT Voicemail or other voicemail similarly provided by a telephone or similar company?
If you are also not able to call outbound, then check whether you have
A. a dial tone, when you lift the handset on your landline phone - if you don't, contact your phone co. and report a problem with your service.
B. ... when you dial a number, what happens? a message? or a tone? or nothing?