[Asterisk-Users] dialplan AGI DTMF

[Vladyslav]

Good day All.
Is there a way to pass DTMF signals to AGI script during conversation ?

Actually here what I want to make:
Users are usually dial using dialplan and when someone press *4 (during
conversation) I want to have agi script to deal with that, but those
users should keep talking and even didn't notice that one of them press
something.

Is there a way to do that or it's complete nonsense? 

-- 
Best regards
Vlad