For some reason my dect phone setup, which includes an answer phone device, is starting to bug out.
When someone calls it'll ask them to leave a message but then cuts the call. So the caller thinks they are leaving a message but in reality the line is dead. So nothing gets recorded on the answer phone.
This might be a problem with the answer phone itself, as the device is fairly old.
But when looking at the BT DV devices they only seem to show wifi phones, and so far I've seen no physical answer phone device. They seem to want me to pay for a voice mail service.
Update:
So I found out it was BT's own voice service cutting in at the same amount of rings that I had set my answer phone for, 7 rings. So I got my answer phone working again by telling BT's voice mail to come in at 10 rings.