Why your caller ID gets flagged as spam, and how to check it

Your caller ID gets flagged as spam when the apps, handsets and networks that screen calls decide your number behaves like a nuisance caller: high volume, very short calls, few answers and complaints from the people you dial. You can check by running your numbers through a reputation check, placing test calls to real phones and comparing answer rates number by number. Fixing it means changing how you dial, not just swapping in new numbers.

What a spam label actually is

When a call arrives, the phone or an app on it looks up the calling number in a reputation database. Depending on the handset and the apps installed, the person then sees a warning on screen, the call goes quietly to voicemail, or it is blocked before it rings. The person you are calling decides in a second or two whether to answer, and a warning label usually settles it.

Three points matter for a contact center:

• Labels apply per number, not per company. One number can be flagged while the rest of your pool looks clean.
• There is no single register. Each app and data provider keeps its own data, so a number can be flagged by one and unknown to another.
• Labels move. A number can pick up a label after a change in calling behavior and lose it again once the causes stop.

Who decides your number is spam

Several layers can label or filter a call before your agent says a word:

• Built-in handset protection. Many Android phones ship with caller ID and spam protection in the default phone app, fed by the manufacturer's or its partners' data.
• Caller ID apps. Third-party apps combine reports from their users with patterns in call traffic. On iPhones, labels typically come from apps like these, and users can also silence every unknown caller.
• Lookup websites. People search unfamiliar numbers and leave comments such as "called four times, nobody there." Those comments can feed the apps.
• Networks and regulators. Operators filter some traffic, and several European countries have introduced measures against spoofed caller IDs. A call showing a number the caller is not entitled to use can be blocked by the network. Check the rules that apply in each country you call.

None of these providers publish their scoring rules, so nobody can give you a safe number of calls per day. What you can do is avoid the behaviors all of them look for.

The behaviors that get numbers flagged

Spam scoring generally combines what people report with how the number behaves. These are the patterns contact centers trigger most easily:

• Heavy volume on one number. Hundreds of calls a day from a single caller ID look like automated calling, whatever the content of the calls.
• Very short calls. Calls that end within a few seconds, whether hang-ups or machines detected and dropped, match the profile of robocalls.
• Low answer rates. When most people decline or ignore a number, scoring reads it as unwanted.
• Silent and abandoned calls. A predictive dialer that reaches a person with no agent free leaves them with silence and a hang-up. That is exactly the experience spam apps exist to warn about.
• Calling people who asked you to stop. Ignored opt-outs and calls to numbers on do-not-call lists turn into reports and complaints.
• Calling at the wrong time. Calls early in the morning, late in the evening or in the wrong time zone invite complaints.
• Numbers that can't be called back. If someone calls back and hears a dead line or an endless ring, the number looks disposable.
• Inherited history. A number that belonged to someone else may still carry its previous owner's reputation.

How to check whether your numbers are flagged

Run these checks before a campaign launches and at regular intervals while it runs:

1. 1List every number that presents outbound. Include campaign pools, numbers agents use on manual calls and numbers left on older campaigns.
2. 2Run a bulk reputation check. Check every number against the spam databases used in the countries you call, and keep the history so you can see when a status changed.
3. 3Call real phones. Place test calls to a few handsets: an Android phone with its default phone app, a phone from another major manufacturer, and an iPhone with a popular caller ID app installed. Use the networks your customers use and note what each screen shows.
4. 4Search the number online. Comments on lookup sites tell you why people complain, which points to the cause.
5. 5Compare answer rates by number. If one number in a pool gets answered far less than the others, on the same list and at the same hours, it is a strong candidate.
6. 6Listen to what comes back. Voicemails and callbacks to your outbound numbers carry opt-out requests and complaints you should act on.

A simple rhythm helps keep the checks routine:

What to do when a number is flagged

1. 1Stop dialing out on it. Take it out of the outbound pool, but keep it able to receive calls so people who call back still reach you.
2. 2Find the cause. Look at the campaign it served: calls per day, share of very short calls, abandoned calls, calling hours and how fast opt-outs were handled.
3. 3Ask for a review. Many caller ID apps and data providers offer a form for businesses to dispute a label or register their numbers. Results vary and nothing is guaranteed, but it costs little.
4. 4Rest the number. Labels often fade once complaints and suspicious patterns stop. There is no fixed timeline, so check again before putting it back into service.
5. 5Replace it only once the cause is fixed. Otherwise the new number follows the same path.

Rotation done right

Rotating caller IDs means spreading outbound calls across a pool of numbers instead of sending everything from one. Done properly, it keeps the volume on each number reasonable and limits the damage when one number is flagged: the campaign keeps running on the others while you investigate.

Rotation is not a way to hide. Every number in the pool should be one you hold, that rings back to you and that identifies the same company. Burning through fresh numbers to stay ahead of labels tends to fail, because the behavior that caused the first label is still there. Presenting numbers you are not entitled to use can also break the rules in many countries. Size the pool to your volume, keep it stable and treat each number as an asset whose reputation you maintain.

Habits that keep numbers clean

• Pace the dialer conservatively. Keep abandoned calls low and watch the abandon rate per campaign. Our guide to answering-machine detection covers the related trade-offs.
• Honor opt-outs fast. Add them to your do-not-call list the same day and block those numbers before they are dialed.
• Call when people can answer. Respect calling windows in the contact's time zone and the rules of their country.
• Make every number answerable. Route callbacks to a queue, an IVR or at least a voicemail greeting that names your company.
• Clean your lists. Remove wrong and invalid numbers instead of redialing them.
• Check on a schedule. Reputation checks should be routine, not something you start after answer rates have already collapsed.

How OVOKY helps

OVOKY covers these checks and habits in the same platform your agents dial from:

• Caller ID reputation runs bulk spam checks on your numbers as background jobs, keeps the history and lets you export the clean numbers. The reputation databases cover France, Belgium, Switzerland and Spain.
• Caller ID rotation spreads outbound calls across pools of your own numbers, round-robin or at random.
• Bulk numbers give every number in a range a voicemail from day one, and screen the voicemails for opt-out requests and abuse so those callers land on your do-not-call list.
• Numbers can route to a softphone, an OVOKY inbound campaign or your own PBX, so people who call back reach someone.
• The DNC compliance list blocks numbers you must not call, and the Predictive Efficiency report shows dial ratio, machine rate and abandon rate, so you can keep the behaviors behind spam labels under control.