(Please forgive me going Off Topic for a few moments. I've never done it before ...

)
When my late parents were old and frail (but not yet 'late'!), my sisters and I subscribed to an alarm service for them. We got them a special speaker phone base station which we programmed with the telephone numbers of 3 family members. The base station sat in their lounge, next to my dad's armchair.
Both parents were given wireless alarm bracelets which they could use to alert the base station if they fell, or there was some other emergency. The system would then repeatedly phone round the 3 family numbers until someone answered. If nobody 'picked up' within a reasonable period of time, somebody from the alarm company would attempt to use the speaker phone to talk to my parents. If they were unable to get a response that way, they would call out an ambulance.
My sister's phone rang at midnight. My brother-in-law answered and heard my father whispering into his extension phone ...
"Please come and help us, there are intruders in the house downstairs!"
B-i-L quickly got on his bike and sprinted round to my boyhood home. He quietly unlocked the front door with his spare key and crept into the house. Sure enough, he could hear somebody's voice coming from the lounge. He threw open the door, leapt in and heard a disembodied female voice coming from the alarm base station ...
"The batteries in this unit need replacing - please do so as soon as possible! ... The batteries in this unit need replacing - please do so as soon as possible! ..."
(But seriously - it was a pretty stupid design feature for a phone system designed for vulnerable people! The message should have been sent to one of the family members on the alert list instead.)