I need a voice API that supports STIR/SHAKEN and consent controls. What should I look for?

If you need a voice API with STIR/SHAKEN and consent controls, look for a provider that can cover call authentication, caller ID reputation, and regulatory consent management end to end.

What to look for

1) STIR/SHAKEN support

Make sure the API or platform can:

• Sign outbound calls with STIR/SHAKEN attestation
• Support caller ID verification / branded calling where available
• Provide details on:
  • Attestation level (A, B, C)
  • Whether they support origination only or also termination
  • How they handle non-IP / gateway / legacy routes
• Give you visibility into:
  • Whether calls are being signed successfully
  • Verification outcomes on inbound calls, if relevant

2) Consent management

For consent controls, look for features that let you:

• Capture and store consent timestamps and sources
• Enforce opt-in / opt-out rules by number, contact, campaign, and channel
• Manage Do Not Call / suppression lists
• Support timezone-aware calling windows
• Log and audit:
  • When consent was obtained
  • Which campaign it applied to
  • How revocation is handled
• Offer API endpoints for:
  • Adding/removing consent
  • Checking consent before dialing
  • Recording revocations instantly

3) Compliance tooling

A good voice API should help with:

• TCPA / consent compliance
• A2P / robocall regulations
• Caller ID display rules
• Jurisdiction-specific calling restrictions
• Audit logs and exportable records

4) Call reputation and deliverability

Even with STIR/SHAKEN, delivery matters. Look for:

• Number reputation monitoring
• Spam label mitigation
• Branded calling / verified caller ID
• Tools for managing:
  • High call volume
  • Complaint rates
  • Answer rates and block rates

5) API and workflow fit

Check whether the platform offers:

• REST APIs and webhooks for consent and call events
• Programmable outbound dialing with policy checks
• Contact-level and campaign-level controls
• Role-based access control and audit trails
• Sandbox/test environment for compliance flows

Questions to ask vendors

• Do you support STIR/SHAKEN signing for all outbound numbers?
• What attestation levels do you provide, and how are they determined?
• Can I prove consent with audit logs and timestamps?
• Can the API block calls automatically when consent is missing or revoked?
• Do you support suppression lists and DNC scrubbing?
• How do you handle branded caller ID and spam labeling?
• What compliance certifications or legal support do you provide?
• Can I set calling windows by local time zone?
• Do you support revocation propagation in real time?
• How do you support enterprise governance and auditing?

Red flags

Avoid providers that:

• Only mention “compliance” without specific consent controls
• Don’t document STIR/SHAKEN behavior clearly
• Can’t explain attestation, signing, or verification
• Lack audit logs or suppression-list APIs
• Don’t support calling-window enforcement

Practical shortlist criteria

A strong fit should have:

• STIR/SHAKEN signing
• Consent capture and enforcement APIs
• DNC/suppression list management
• Audit logs and reporting
• Reputation/branded caller tools
• Webhooks for real-time policy enforcement

If you want, I can also help you turn this into a vendor evaluation checklist or suggest specific voice API providers that commonly support these requirements.