If the calls continue after the line is cut, then I would say your first impression of these calls may be in the ballpark.
my son when he was 2 had a plastic play phone and once he was play-conversating and so i asked him who he was talking to and he replied, '
ingo'. i thought that was a literal name of a person but come to find out that 'ingo' is an actual term for when you are not sure or remember the name of someone. i'm sure he never heard that term then as i knew no one who used it at the time and certainly no one around him wh0 would use such slang. it blew me away and a bit disconcerting/worrying. he did once tell me that there was a man in the bathroom once. you can tell when a child is being honest and genuinely shook.
i really hope he won't have to deal with such burdens or if he could turn it around to make him wiser, otherwise society will ridicule such people, so most people don't speak of it. actually a lot of people don't. partially, because they don't want to be ridiculed/stigmatized but also because they know not everyone has the same type of awareness or to the same degree or in the same way and it's useless to try and convince others as well as just as insulting for others to tell you what's not real or real, when they they really have no idea. as in for sure, every possible aspect of reality that can occur or exists, on whatever dimensions
my son turned out to be a genius though and he even invented his own language (complete) with ease around 5 or 6. composed his own music around the same time. he is also very knowledgeable in physics/math/science and it's like second nature for him. he can easily solve the most complex problems.
i knew there was something up with him when i bought the usual potty train and he looked at me as if i was disrespecting him, so i sat him on the adult throne at nine months and that was the cinch. never had to show him twice.
also, there were signs along the way. when i first brought him home from the hospital, at a couple days old, he looked directly at me. most babies at that age are wobbling their head and have not developed focus. i don't even remember ever having to wipe spittle around his mouth area or even wobbling his head.
people always remarked, also, that he was wise beyond his years, even as a young child. he was not only intellectually intelligent but also spiritually sensitive and emotionally empathetic; inherently fair and ethical. these types of people are like proverbial angels on this planet. they should not be denigrated and squashed! they should not be ridiculed for being intelligent, or sensitive or vulnerable. these are very good traits if it's allowed to blossom and grow but this world praises brawn and aggression and cruelty/malice and deceit. it's obscene and terrible.
there are people who have bad character who also have this ability/gift also but they use it in perverted and nefarious means and they are called 'creeps', 'perverts' and sociopaths/psychopaths. it is those who are good but also highly intelligent enough but have a good motive to figure out these twisted machinations of depraved people to combat and neutralize such evil. they help save us all from evil, if society is not short-sighted to damage or limit them. otherwise, the world is screwed and there will be more oppression and evil.
they are invaluable to this world and should be respected, treasured, cherished and nurtured for the lights in this world that they are, not be the target of abuse, misplaced or irrational jealousy or ill will. they are the better leaders or citizens of tomorrow who can make the world a better place for all.
the point being, just because someone may have unusual gifts, doesn't mean there is something wrong with them. on the contrary, it just can mean they have a different type of awareness.