While you wait for answers, we may have found some information which could help you.
Click here for Cordless Phone No Dial Tone Phone Line
How to fix Telstra 8950 answering machine?
Telstra v850a handset reads line in use. Can't get a line?
My cordless phone says Base 1 (Telstra 7100) ?
Telstra 7100A, "Not Registered"?
telstra 6100a with 4 handsets?
How can I add a handset to telstra v580a?