What Are the Biggest Compliance Gaps in Pay-Per-Call Tracking?

One thing I’ve noticed with pay-per-call is that the tracking can be solid while the compliance trail behind it isn’t always as easy to verify.

Consent records and call-recording disclosures are obvious areas, but things can get more complicated when multiple publishers or traffic sources are involved especially if there’s a dispute and you need to trace a call back to its source.

What compliance gap has caused the most trouble in your experience?