Outline — full article in progress
This page has the structure and introduction. The full article is being written by the network team. In the meantime, ask us directly.
If your call centre dials US numbers, STIR/SHAKEN attestation has a direct effect on how many people pick up. This article explains attestation levels A, B and C, how spam-labelling engines use them, and what you can do to keep your numbers from being flagged. For the wider picture of US calling, see our US SIP trunk guide.
What STIR/SHAKEN is
Attestation levels A, B and C
How attestation affects answer rates
- Spam labels and call blocking
- Why international traffic usually lands as C
Protecting your number reputation
- Owning and registering numbers
- Avoiding number rotation