How to prevent your company number from appearing as spam: reputation, best practices and STIR/SHAKEN

One of the biggest frustrations of companies that use telephony is discovering that their numbers appear as spam or suspicious calls on the customer's cell phone. This can happen even when the company is legitimate.

Spam classification typically depends on reputation systems, user reports, traffic patterns, call frequency, and the manufacturers' or apps' own algorithms. Therefore, there is no single action capable of solving all cases.

Why a business number can appear as spam

High volume of calls in a short period of time

Low attendance rate

Too many very short calls

User complaints or reports

Outdated contact lists

Excessive frequency for the same recipient

Misuse of the number by third parties

Spoofing using the company's identity

STIR/SHAKEN solve the spam problem?

Not alone. STIR/SHAKEN authenticates the origin of the call; Reputation systems classify behavior and perception of number. They are related but different problems.

Authentication, however, is an important layer because it helps protect the identity of the number and reduces the possibility of third parties spoofing that origin. This can contribute to a broader phone reputation strategy.

What the company should do

Use consistent and properly managed corporate numbers

Avoid aggressive and repetitive dialing

Keep contact bases up to date

Respect consumer consent, schedules and preferences

Monitor reputation of the numbers used

Adopt call authentication with STIR/SHAKEN when available

Use RCD and Verified Origin to improve call identity and context

Why Verified Origin is strategic

The evolution of telephony points to a scenario in which the identity of the caller no longer depends only on private reputation bases and also has authentication integrated into the telecommunications infrastructure.

For businesses, this means a new layer of brand protection and transparency. The goal is not to "trick" spam filters, but to build legitimate, traceable, and recognizable communication.

How Voicecorp can help

Voicecorp works with STIR/SHAKEN and Verified Origin within a broader corporate telephony strategy. Companies that use SIP Trunk, cloud PBX, 0800, or outbound operations can evolve their voice architecture to add authentication and identity to calls.

YOUR NUMBER MUST NOT ONLY BE SEEN, IT MUST BE RECOGNIZED AND AUTENTICADO0800 102 4141 • voicecorp.com.br

References

Anatel - Authentication and Caller ID

ABR Telecom - Identification and Authentication Authority