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?

https://docs.asterisk.org/Asterisk_20_Documentation/API_Documentation/AMI_Events/DTMFBegin/#arguments

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.
Thanks

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