Without going into details, as it is a very long story, if you fear someone may be suicidal, or in danger of becoming suicidal, once you have exhausted all efforts to get them to seek help for themselves, what can you do? The person in question has been referred for a telephone consultation with a psychiatrist in the past but says they cannot talk about their problems on the phone.
I can see there are any number of reasons why the authorities would not respond on the say so of a random person calling them but DH is at his wits end about a friend he fears is going to end up harming himself and we have no idea what we can do.