Free tool
STIR/SHAKEN Attestation Tester
Not sure what attestation level your calls carry? Test it and find out whether your outbound calls are signed at A-Level.
Are your calls signed and delivered?
Chances are, your carrier isn't delivering SHAKEN A-Attestation tokens with your calls. When that happens, your calls are more likely to be marked "spam likely."
Run a free, no-obligation SHAKEN test to determine whether they are signed and delivered.