While you wait for answers, we may have found some information which could help you.
Click here for Cordless Phone RegisterTelstra 7100A, "Not Registered"?
How to fix Telstra 8950 answering machine?
telstra 6100a with 4 handsets?
Telstra cordless 6100a Won't make calls?
How can I mend my Telstra 12250 cordless phone?
My caller id is not working?