I installed and manage CallRail on behalf of a client.
CallRail is the go to tool for measuring your adwords marketing efforts.
It will tell you what keywords customers used when they call you from Google.
Not only that, but it will record the calls if you so wish, and it will tell you how long each call was, and even who called, if the number is published.
The best part about CallRail is the customer support.
They were so gracious, and came to my aid right away when I didn't know how to do stuff.
They walked me right through it and when I got stuck they pointed me in the right direction.
They did this both via phone call and email.
It's super important to measure your marketing efforts and CallRail does the trick.
They can no longer track keywords coming from Google Organic searches.
That's not CallRail's fault though. Google made changes and made it impossible to track those.
CallRails solves the problem of not knowing which of your Adword keywords are making you money.
You can rely only on what Google tells you, but their idea of a "conversion" is woefully inaccurate. So you need a tool like CallRail to confirm that you are actually getting conversions from the phone calls.