In what way does Google's phone call conversion tracking feature track calls to an advertiser's account?

Google Ads phone call conversion tracking works by dynamically generating a unique Google forwarding number that appears on the advertiser's website or in their ads. When a user calls this forwarding number, Google records it as a conversion. This system allows Google to attribute the call to a specific ad click or impression, providing valuable data for campaign optimization. The Google Click Identifier (GCLID) is used for website conversions and offline conversions, not directly for tracking calls made through forwarding numbers. The conversion name is simply a label for the conversion action, not a tracking mechanism. Tracking calls via the phone number listed on the advertiser's official website would not allow Google to differentiate between calls originating from ads and other sources.