While you wait for answers, we may have found some information which could help you.
Click here for Caller Id Not WorkingHow to fix Telstra 8950 answering machine?
Telstra cordless 6100a Won't make calls?
Telstra v850a handset reads line in use. Can't get a line?
My caller id is not working?
Telstra 7100A, "Not Registered"?
How can I mend my Telstra 12250 cordless phone?