Thank you for your response.
She should be able to book an engineer via the messaging service.
Is she still awaiting a response after being transferred to the relevant department?
You can use two phones depending on what the phones are. This has to be a slave and master set up meaning you can not have two master phones.
Now you have your adaptor, that is all you need 🙂
There is some helpful information here on how to set the phone up now you have your adaptor.
Please let us know how you get on.