Recovering After a Deliverability Drop: The 30-Day Playbook

Recognizing a Deliverability Drop vs. a List Problem

The first diagnostic step when connect rates fall is distinguishing between two different root causes that look identical from the top-level metrics:

A deliverability drop means your numbers have been labeled, your calls are being dropped by carrier spam filters, or your STIR/SHAKEN attestation has an issue. The symptom is falling answer rates across numbers that were previously healthy, with no corresponding change in list quality.

A list quality problem means your contact data has gone stale — numbers disconnected, contacts changed jobs, the list was never good. The symptom is rising 404/480 SIP responses (not 603 Declines) and declining conversation quality when calls do connect.

Pull your SIP response code distribution for the past 7 days. A deliverability drop shows elevated 603 Declines. A list problem shows elevated 404/410/480. The remediation is completely different for each.

This guide covers deliverability drops. If your problem is a 404/480 spike, the fix starts with list hygiene and DNC scrubbing.

Day 1–3: Stop the Bleeding

The worst response to a deliverability drop is to continue dialing at full volume from labeled numbers. Every additional call from a labeled number generates more negative signals that make remediation harder.

Immediate actions:

1. Pull all active campaign numbers from production. Suspend calling from any number that has been at or above volume ceiling for the past week.
2. Dial each suspended number from consumer handsets on AT&T, Verizon, and T-Mobile. Confirm which numbers carry labels and on which carriers.
3. Separate numbers into three groups: Clean (no label on any carrier), Watchlist (label on one carrier), Flagged (label on two or more carriers).
4. Return only Clean numbers to production, at 50% of their previous daily volume ceiling.

This immediately protects your Clean numbers from contamination while you work the remediation process for labeled ones.

Day 4–14: Active Remediation

For Watchlist and Flagged numbers, submit formal remediation requests through each analytics engine portal:

• Hiya Connect (app.hiya.com): submit business identity, call purpose, and campaign description
• TNS Call Guardian: access via your carrier or directly at their business portal
• First Orion INFORM: submit through INFORM's business registration

Remediation decisions typically take 5–10 business days. Some numbers will be cleared; others will not. Plan on retiring 30–50% of your Watchlist numbers and 80–90% of your Flagged numbers.

While remediation requests are pending, provision replacement numbers for the ones in quarantine. UnlimCall provisions caller IDs on demand across 33 markets — there is no wait. Request replacements in the same area codes as your quarantined numbers to maintain local presence match.

Begin seasoning replacement numbers immediately. Day 4 replacement numbers will be ready for full campaign load by day 14 if you start the ramp on day 4 rather than waiting until remediation results come in.

Day 15–21: Pool Reconstruction

By now you have remediation responses in hand. Cleared numbers return to production at a reduced daily ceiling (50% of previous maximum) for a 14-day observation period. Numbers that were not cleared are retired permanently.

Pool reconstruction priorities:

1. Get active pool size back to the level that supports your daily dial target — use the pool sizing formula to calculate exactly how many active numbers you need
2. Segment the reconstructed pool so cold prospecting, warm follow-up, and customer-service calls each have dedicated numbers that cannot cross-contaminate
3. Ensure every number in the reconstructed pool has been submitted for branded calling enrollment — this is the structural protection that makes future drops less likely

Day 22–30: Root Cause Fix

Deliverability drops do not happen randomly. Something changed before the drop. The most common root causes:

• A campaign started exceeding per-number daily volume ceilings (usually because a new campaign was added without expanding the pool)
• AMD settings were misconfigured and started generating thousands of short connects (sub-5-second durations) that registered as robocall behavior
• A vendor or subcontractor gained access to the number pool and used it for high-volume blasting
• A new campaign type (e.g., transitioning from warm follow-up to cold prospecting) was run on numbers calibrated for warm-follow-up volume tolerances

The root cause audit: pull per-number daily volume for the 30 days before the drop and look for the date and numbers where volume first exceeded your defined ceilings. That is where the problem started. Then check the campaign configuration change log for what changed on or before that date.

Document the root cause in your operations log and implement the structural fix before resuming full-volume operations. If you skip this step, you will be doing this playbook again in 45 days.

The Ongoing Operating Model After Recovery

Recovery is also an opportunity to move from reactive to proactive deliverability management. The three additions to make before month 31:

1. Automated volume-per-number alerting that quarantines any number exceeding daily ceiling without supervisor intervention
2. Weekly handset audit protocol — 30 minutes every Monday dialing active numbers from consumer SIMs
3. Pool capacity buffer — always maintain 20% more clean numbers than current campaigns require, so a sudden quarantine event does not interrupt operations

Teams that implement these three changes after a recovery event almost never experience a repeat deliverability collapse.

Cost of Recovery on a Flat-Rate Network

On per-minute billing, a deliverability drop is doubly expensive: you pay for failed attempts and you lose the revenue you would have generated from successful calls. On UnlimCall's flat-rate model, failed calls do not increment a counter — you are paying a fixed amount per seat per month regardless of how many dials connect. The economic incentive to run a clean, sustainable number pool rather than burning through numbers at maximum velocity is built into the pricing model.