NBN Voice service problem

I have a Telstra NBN FTTN service with a Tetstra modem.

When I call certain phone numbers they return a busy signal.

Wen I call the same numbers with my Optus mobile, the same number returns a ring tone.

This happens with several business numbers in SA and interstate.

I have restarted the modem, unplugged the phone etc....no change.

Any ideas?

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