Keyword level call tracking refers to tracking techniques allowing marketers to link phone calls made from a website with the keywords used for accessing the website. Keyword level call tracking is a precious way to measure paid search (PPCs) and SEO effectiveness and ROIs. It allows marketers to optimize AdWords spending.
For organic traffic, keyword call tracking requires to use session-based DNI.
For more details about keyword level call tracking, see session-based tracking. See also call tracking for the overall process.