Weird event at work - should I do anything?

[Beanzmeanz]

Just that really. So last week I received a call on my personal mobile asking for someone else I didn’t catch what they were saying so asked them to repeat it. It wasn’t a name of anyone in our house - think Harry Jones so I said sorry wrong number.
Just as I was about to hang up I thought the name sounded a bit like someone I work with so I said did you say Barry Stones to which they said yes.
So I said well I work with them but I don’t know how you would get this number. They confirmed who they were (genuine) and that they had called the number of this person’s email footer.
I am bamboozled so I report it to our IT bod.
They ask me if my no. is 07xxx etc which it is and tell me this guy has set his v/m to forward to my mobile.
He doesn’t have my mobile, I’ve never given it to him and we have work mobiles

His work mobile was diverted to her personal mobile!

OP hasn't told us whether the number on Barry's email footer is his work mobile or his work desk phone. IT could tell it had been set up with call forwarding: could they do that with a mobile?

Wait, in her last message, OP said:

The caller dialled the office direct dial number on Barry’s email.

That doesn't sound like a mobile to me.

I wonder if we will ever find out...

You're right. I've never worked anywhere we've had work mobiles and direct lines because everyone uses their mobiles. (We do have access to landlines in the office though). So work mobiles are on email footers.

For goodness sake ASK HIM.

The very last thing she should do is engage with him in any way.

Agree.