Hi there Judy and welcome
What exactly happens when you call here from the landline? Does it ring still at all?
I checked, and there is no ability to block calls with this model phone, so the phone itself is not blocking, but this means it is likely here phone provider.
Have her call her phone provider and remove any blocks on the line, then try to make a call.
Let me know the results please.
ok, as there is no blocking on the phone that can be done, so it has to be with the provider, only place it can block.
If you have continued problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service for now by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.