Why numbers get flagged
Carrier and analytics systems monitor calling patterns on every number: volume, answer rate, call duration, and complaints. A number that dials heavily right out of the gate looks like the pattern used by illegitimate callers, even when the calls themselves are entirely legitimate. Ramping up gradually, alongside verifying your Business Identity and Voice Integrity, is what signals to carriers that a number belongs to a real, registered business.
Start with the foundation
Before working through the warmup steps below, confirm you've completed:
- Business Identity and Voice Integrity verification. This is the single biggest lever for reducing spam labels, since it tells carriers who's actually calling. See our guide: Business Identity and Voice Integrity: How to Register and Protect Your Caller ID
-
A ConnectionBoost pool sized to your calling volume, if you're using local presence numbers. Spreading calls across multiple numbers per area code, rather than concentrating volume on one, meaningfully lowers the odds any single number gets flagged.
Warm up your numbers gradually
Consider following this warmup schedule, if time and patience allow:
| Week | Calls per Day per Number |
| 1 | 1-5 |
| 2 | 6-10 |
| 3 | 11-15 |
| 4+ | 15-20 (if healthy) |
Respect Calling Hours
Keep outbound calls between 8:00 AM and 9:00 PM in the recipient's local time zone. Calls outside that window are one of the fastest ways to generate complaints, which directly damages number reputation.
Set your PowerLists up to help automatically
In your PowerLists, configure target hours and a reasonable daily volume cap per number, and prioritize calling warmer leads first. This keeps your calling pattern healthy by default, rather than relying on manually pacing every number yourself.
Pro tips
- Call colleagues' cell phones and stay on the line over 10 minutes per call, having real conversations, to build early call-duration history.
- Call warmer leads first to maximize pickup rates.
- Avoid patterns that read as illegitimate: short calls, double-dialing, no answer, low call duration.
If a number still gets flagged
No warmup schedule or registration step can guarantee a number is never labeled "Spam" or "Potential Spam." If it happens, reach out to support, and we'll review your account's Business Identity, Voice Integrity, and calling pattern together to find the right fix, which may include replacing the number.