The end of the dark funnel: Attribution in the age of AI search

by

Kara Kelly
December 19, 2025

Search has fundamentally changed. When a customer receives an answer from an AI assistant, an LLM, or a Search Generative Experience (SGE), they might skip the website, turning the traditional top-of-funnel into a dark funnel—a massive blind spot where customer intent disappears.

As LLMs evolve, they are increasingly presenting the most authoritative phone number (often your primary business line) directly in the answer. This creates a critical attribution gap.

While some vendors are rushing to propose complicated workarounds—asking you to manage complex, dedicated tracking numbers for every AI endpoint—CallRail is focused on a better, more universally reliable solution: intent attribution.

We've leveraged our market leadership in Dynamic Number Insertion (DNI) and our cutting-edge, patent-pending Self-Reported Attribution to create the only attribution strategy that provides a clear, actionable picture of the LLM-driven customer journey.

The CallRail two-pronged approach: Clarity over complexity

Our solution ensures that every lead, whether they click through to your site or call directly from an AI result, is fully attributed.

Prong 1: The foundation — Full session tracking

For users who click through from an AI summary or SGE result and land on your website, our core DNI technology immediately takes over:

  • Click-through clarity: CallRail’s snippet instantly attributes the full session back to the specific LLM referrer (e.g., Google SGE, Bing AI).
  • Complete digital journey: You capture all the essential details—including the landing page—giving you context on what part of the AI’s answer drove them to your site.
  • Universal visibility: This works seamlessly with your DNI setup, tracking all LLM top-of-funnel use for calls coming through numbers connected to your website.

This is out-of-the-box functionality with every keyword pool (included in our base offering), and works even if you set up your CallRail DNI years ago.

Prong 2: The quantum leap — Intent attribution via self-reported attribution

This is the only way to reliably eliminate the dark funnel when the customer finds you through an LLM but doesn’t click through to your website.

When a customer gets your number directly from a chatbot or SGE answer (a zero-click call), traditional tracking methods fail. You get the call, but the source will be misattributed to whichever number gets referenced, and you’ll get no intent. Attempts to force an LLM to surface a specific tracking number are proving to be unreliable at scale, as AI tools prioritize the established, primary phone numbers they deem most authoritative.

The Self-Reported Attribution advantage: Attributing the conversation, not just the number.

Our patent-pending Self-Reported Attribution product is the game-changer:

  • Independent of the number: Self-reported attribution works across ALL your tracking numbers, and critically, can work on your main business line (your DNI swap target and most reliable LLM referenced number), as long as it is tracked by CallRail.
  • Conversation intelligence core: CallRail analyzes the call transcript specifically for conversational cues and customer-stated intent, extracting phrases like: "I just asked Gemini for local lawyers..." "I got your number because ChatGPT recommended you for a new roof..." 
  • Actionable intent: The attribution and intent signals are categorized for easy aggregate reporting, alongside software-based attribution and the landing page data,  if there was a click-through.  You can set up automation rules to tag and add value by any of these intent signals or conversational keywords for even deeper insights and workflow enablement.

The CallRail difference: Clarity, safety, and actionable data

As AI-driven discovery becomes the new norm, you need a solution that is safe, scalable, and provides true competitive advantage:

  • Risk-free tracking: We focus on getting data reliably, rather than relying on risky tactics that could jeopardize your NAP (Name, Address, Phone) consistency or SEO rankings while driving up your phone number cost.
  • The intent advantage: We give you actionable data. While other solutions may confirm the channel, CallRail gives you key context on what the customer was asking AI, allowing you to optimize your content, AEO strategy, and messaging.
  • The complete picture: By combining DNI for click-throughs and Self-Reported Attribution for top of funnel searches or zero-click direct calls, we offer the clearest, most comprehensive view of how AI is driving high-value conversations.

Stop losing leads in the dark funnel. With CallRail’s intent attribution, you gain the complete, clear picture of the entire LLM-driven customer journey—from the initial AI query to the final conversion.

Meet the author

Kara Kelly
Kara is CallRail's VP, UX where she’s led UX & UI Design, Content Strategy and User Research since 2015. Kara likes party planning, recipes, and painting portraits in Atlanta where she lives with her family.