STIR/SHAKEN and Caller ID Reputation: Ensuring Your Outbound Dials Actually Connect

# STIR/SHAKEN and Caller ID Reputation: Ensuring Your Outbound Dials Actually Connect Even the most compelling telemarketing offer is completely useless if your telephone numbers display as **"Spam Likely"**, **"Scam Likely"**, or **"Fraud Alert"** on consumers' mobile phones. Major US telecommunications carriers—including AT&T, Verizon, and T-Mobile—use automated behavioral algorithms to flag numbers that exceed dial volume thresholds or generate consumer spam reports. --- ## Understanding STIR/SHAKEN Attestation Levels The FCC's STIR/SHAKEN framework attaches cryptographic certificates to SIP phone calls: * **Attestation Level A (Full)**: The carrier knows the customer, has verified their right to use the telephone number, and guarantees caller authenticity. * **Attestation Level B (Partial)**: The carrier knows the origin of the call, but cannot verify if the caller is authorized to use the specific Caller ID number. * **Attestation Level C (Gateway)**: The call originated outside the provider's network (highest likelihood of being labeled spam). --- ## Best Practices for Number Health 1. **Automated Number Rotation**: Avoid dialing more than 75 to 100 calls per day per telephone number. 2. **Branded Caller ID (Caller Name / CNAM)**: Registering corporate entities with Free Caller Registry and carrier databases ensures your company name displays cleanly. 3. **Daily Carrier Reputation Audits**: Continuously monitoring call completion rates and replacing flagged numbers before agent contact rates decline.