When Vapi shows a phone number as "likely spam," it typically means your telephony provider is flagging your virtual number. This often happens due to excessive call retries, especially when Vapi indefinitely retries calls that are rejected. To resolve this issue:
Register with STIR/SHAKEN and CNAM
- Ensure your telephony provider implements STIR/SHAKEN protocols
- Register your number with a CNAM database for proper caller ID display
- Avoid high-volume, short-duration calling patterns that resemble spam behavior
Sources:
- [Discord conversation about indefinite call retries](
https://discord.com/channels/1211482211119796234/1338810971153760296)
- [Discord conversation about call filtering standards](
https://discord.com/channels/1211482211119796234/1334866220624908341)