Question problam with voice dialing when swipe down

Hi

I have a problam with voice dialing.when I swipe down on screen it goes in the lock screen and don't show voice dialing.it's worked perfectly when I bought It.I uninstalled a app but I don't know what is this.
I'm on stock Rom 1.54
How can I fix it.please help !!!! It's important for me.


Edit 1: is it possible this issue not property this known app?