Re: How to send the person calling a busy signal.

I have an 84-year old friend who lives in another town.  Now that he's
moved, he only has a cell.   Today I called him and after a few rings,
he seemed to anseron hut I only heard a couple "uh"s and then got a busy
signal.
 What can the person receiving a call possibly do to give me a busy
signal once he has answered, or even before he answers???
 With a cellphone or, for that matter, if it had been a wired phone?
 I hung up and waited 5 minutes to give him a chance to call me, but when
he didnt' I called and there was no answer.  90 minutes later I called
again and it was like the first time, but with even less noises at the
other until I got the busy signal.
 Disregarding the busy signal, whose ofigin I could not fathom, I
envisioned him answering the phone but unable to bring it to his mouth.
He's had a lot weakness lately.   And I called his son who lives nearby
to alert him.  His son writes that he talked to him and he's fine.   So
what accounts for all this including the busy signals??