Call Filtering & Code 600 Reject Service for Telecom Providers

Identify and stop risky calls before they damage your reputation. Real-time filtering with clear SIP response codes gives you control and protection.

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The Cost of Unchecked Calls

Illegal, invalid, or non-compliant calls can quickly lead to blocked traffic, customer complaints, and even regulatory scrutiny. The challenge is knowing why calls are being rejected before it impacts your business. Without that insight, you’re left in the dark, losing revenue and trust.

Carriers may block your calls if they appear suspicious or non-compliant.
Poor call hygiene leads to reputation damage and customer frustration.
Without diagnostic insight, troubleshooting blocked calls wastes valuable time.

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Prescott Martini’s Code 600 Reject Service

Our Code 600 Reject Service sits at the front of your call routing to filter traffic in real time. By screening calls against compliance and numbering databases, we identify issues immediately and return clear SIP codes that pinpoint the exact reason for rejection.

What We Do:

Screen calls for compliance and numbering validity.
Provide standardized 60X SIP codes for fast troubleshooting.
Integrate filtering directly at the SIP level of your switch.
Allow you to decide whether to allow or block calls based on your own routing logic.

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Real-Time Call Filtering Made Simple

Here’s how our filtering service protects your traffic:

Your business gains the ability to sign its own calls with confidence and meet full STIR/SHAKEN compliance.

Integration

Installs at the SIP level for seamless call screening.
Screening

Validates Caller ID, STIR/SHAKEN token presence, and Do-Not-Call / Do-Not-Originate lists.
Diagnosis

Provides SIP 60X codes with clear reasons for rejection.
Control

You decide whether to allow or disallow flagged calls in your routing.

Affordable Filtering for Any Call Volume

Prescott Martini’s Call Filtering service scales to match your call volume — from smaller providers to high-capacity carriers. Our flexible approach ensures you get the protection you need without overpaying, and bundled discounts are available when combining Call Filtering with other Prescott Martini services.

Schedule a consultation today to discuss your call traffic and get a tailored solution that fits your business needs.

Schedule Your Consultation

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Why Providers Trust Prescott Martini

We deliver more than call filtering — we provide clarity. With clear diagnostics and client-first confidentiality, Prescott Martini helps you protect your business and reputation.

Real-time call screening at the SIP level.
Clear, standardized 60X reject codes.
Flexible control over call routing.
Discounted pricing when bundled with fraud prevention or compliance services.

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Protect Your Traffic with Confidence

Don’t wait for carriers or regulators to flag your calls. Take control with Code 600 Reject Service and ensure your traffic stays clean and trusted.

Schedule a Consultation