If your outbound answer rates have declined over the past 12 to 24 months without an obvious operational cause, number health is almost certainly part of the explanation. Carrier-level spam labelling has become one of the most significant performance variables in outbound contact centre operations.
How Carriers Decide to Flag Your Numbers
There is no single standard. Each major carrier uses proprietary algorithms, but the inputs are broadly similar: complaint volume, calling patterns, the ratio of answered to unanswered calls, and SHAKEN/STIR attestation level.
What You Can Do About It
- Monitor number health daily, not weekly
- Rotate numbers before they become flagged, not after
- Retire flagged numbers rather than continuing to use them
- Achieve full-A SHAKEN/STIR attestation on all outbound traffic
Number health is not a compliance issue — it is a revenue issue. Every Spam Likely label on one of your numbers is a direct reduction in reachable customers.