Answer-Rate Performance
Spam flags are measurable. So is fixing them.
See exactly which carriers flag your numbers, rotate in clean caller IDs, and watch the pickup rate move.
Carrier flag monitoring
We check your numbers against carrier spam databases continuously — not once a quarter.
Health score per number
Every caller ID gets a 0–100 health score with Clean, Watch, and Flagged states.
Automatic rotation
Flagged numbers are pulled from rotation automatically and rested until they recover.
Causes
Why a number gets flagged.
A spam flag is not a verdict on your company. It is the output of patterns that carrier and handset-app detection systems evaluate. The patterns are known — and most of them are within your control.
High call volume in a short window
A number that dials hundreds of destinations in an hour looks like automated bulk traffic to every detection system. Spreading across several numbers lowers that signal.
Short call duration
A high share of calls lasting a few seconds reads as an indicator of unwanted calls. The signal appears even when recipients simply hang up quickly.
Low answer rate
A number that is rarely answered keeps losing score. The effect compounds unless someone intervenes.
User reports
Reports from handset apps take effect immediately. A handful is enough to list a number as suspect in a database.
An unreachable number
People who call back and reach nothing are more likely to report. A number with no inbound path ages faster.
The number's history
A number carries its history with it. An endpoint previously used for bulk campaigns does not start from zero.
What the recipient sees
Between your call and their screen.
Several parties sit between your call and the recipient's display: their carrier, the handset operating system, and any call-screening app they have installed. Each can show a warning or silence the call.
These systems maintain their own databases and do not publish their scoring criteria. That is why the only dependable measurement is not a promised label but the observed answer rate per number. The scale and effect of call labelling is documented, among others, in Hiya's annual State of the Call report, whose 2024 edition is based on 221.3bn analysed calls.
Source: Hiya, State of the Call — annual report, 2024 edition covering 221.3bn analysed calls
Remediation
What we do when a number goes bad.
Detect
Every number is checked continuously against spam databases and scored additionally on its own answer rate. The health score runs from 0 to 100.
Pull from rotation
Below the threshold the number is blocked for outbound calls. Inbound stays active so people you already contacted can still reach you.
Rest it
The number stays free of outbound traffic until its score recovers. A number that keeps dialling while flagged does not recover.
Promote a replacement
A clean number from the same area code takes over. The campaign continues without anyone stepping in.
Dispute it
Where a flag is clearly wrong, we pursue removal with the database concerned. There is no entitlement to removal — the operators apply their own criteria.
Fix the cause
Repeated flags on the same campaign are a pattern, not bad luck. We show you the dial rate and call durations behind it.
Measurement
Four numbers that matter.
Answer rate alone says little once it is averaged across every number. We measure per number and per campaign.
Answer rate per number
Answered calls against dial attempts. The only metric that directly reflects the effect of a given number.
Health score
A 0–100 score per number, with Clean, Watch, and Flagged states.
Short-call share
Calls under fifteen seconds. A rising share usually precedes a flag.
Callback rate
Inbound calls to an outbound number. A high value suggests the number is perceived as legitimate.
Observed trajectory
Among teams that moved to assigned geographic numbers with continuous reputation monitoring, the answer rate rose from 31% to 68% over twelve weeks. That is a XETEL platform figure, not a commitment for your result.
Source: XETEL platform figure
Scope
We do not evade spam detection.
Some vendors promise to outsmart detection systems. That is not our business. Detection systems exist to filter unwanted calls — that goal is legitimate.
Our approach is to remove the signals that make a legitimate campaign look suspicious: too much volume on a single number, callback numbers nobody answers, and numbers that keep dialling long after they were flagged.
Whether you may call a given contact is decided by § 7 UWG. Obtaining and documenting consent is and remains your job. No technical measure substitutes for it — and a campaign without consent does not become lawful because the numbers are clean.
Frequently asked questions
Can you commit to a specific answer rate?
No. The number influences whether a call is picked up; so do your audience, your reason for calling, and the time of day. What we commit to is that you see the answer rate per number and that flagged numbers rest automatically.
How fast do you detect a flag?
We check spam databases continuously and additionally score the observed answer rate. A drop in answer rate is often the earlier signal, because it does not depend on a database having listed the number yet.
Can a flag be removed?
Sometimes. Where a flag is clearly wrong, we pursue removal with the database concerned. There is no entitlement, because operators apply their own criteria. Resting the number and fixing the cause is more reliable.
Does adding more numbers solve it?
Only partly. More numbers spread the load and reduce the volume signal per number. If calls stay very short or the audience is wrong, many numbers will age out quickly too.
Does XETEL help evade spam filters?
No, and we do not offer it. We remove the technical signals that make a lawful campaign look suspicious. Whether the call itself is lawful is governed by § 7 UWG and remains your responsibility.
How long does a flagged number have to rest?
It depends on the database and on the number's history, and cannot be stated as a fixed period. That is why we hold a reserve of clean numbers so the campaign keeps running during the rest period.
Sources
Every market figure on this page comes from the publications below. XETEL's own platform figures are labelled as such.
- Hiya, State of the Call — annual report, 2024 edition covering 221.3bn analysed calls
- Bundesnetzagentur, 2024 annual figures on number misuse
- § 7 UWG (German Act Against Unfair Competition)
- XETEL platform figure