How to get to know who is pressing the DTMF

I am developing a small application where users can call each other through trunks.
I have two users User A User B, now how to get to know Who has pressed the digits?

One is the uniqueid, which is unique for the channel. The other is linkedid which groups channels together.

I don’t know what “how can we get the users from it” means within this context.

Hi, got an answer from the website. I was little bit confused in this.

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