What "Click-to-Call" or its equivalents might have looked like in 2000 (Very Basic):

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"Request a Call" Forms: The closest equivalent would have been a web form where a user entered their phone number and requested a callback from a company. The "click" here was the submission of the form, not the initiation of a call on their end.
Customer Service Software (Internal): Some advanced call centers or customer ghana phone number list service operations might have had internal "click-to-dial" functionality within their CRM or phone systems, allowing agents to click a customer's number to dial, but this was for internal efficiency, not for public lead generation.
Phone Numbers Prominently Displayed: The "call to action" on websites and early online ads would simply be a clearly visible phone number, often a toll-free number (e.g., 1-800-YOUR-BIZ). The expectation was that interested parties would manually dial it.
In summary: "Click-to-call leads" as a distinct, automated lead generation channel in 2000 for B2C or B2B was virtually non-existent. The technology for seamless integration between web Browse and phone dialing (especially on mobile devices) was simply not mature enough for widespread commercial application. Lead generation that resulted in phone calls was driven by traditional advertising and prominent display of phone numbers on nascent websites, requiring manual dialing by the interested prospect.