How to track paypercall with google adwords?

[npbuddy]

I'm running paypercall offer with adwords and using redtrack.But paypercall is custom offer , not from network.I want to know which keywords converted.Now i can see only which keywords used for enter my website like this : View attachment 17282
Is there any way to know which keywords clicked to my calls button in website? Redtrack can do all things or i need custom code?
Thanks for answers and sorry my