Block Anonymous Callers

Block Anonymous Callers2021-04-07T14:17:00+00:00

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Block Anonymous Callers Service

The Block Anonymous Callers service intercepts calls from people who have used a blocking feature or withheld their number to prevent their name or number from being provided to people they call.

How are Anonymous Callers Blocked?

Cleartone uses both an automatic spam blocking system, which applies to any call entering the platform, and as further security to Cleartone customers we offer a user-level setting that allows the customer to control what calls should be blocked to their number.

What happens when Anonymous Callers are Blocked?

When our Block Anonymous Callers Service is activated, callers with a withheld number hear a message telling them to hang up, unblock delivery of their phone number and call again. Your phone will not ring unless the caller removes the block.

How do I activate the Block Anonymous Callers Service?

Please give your Account Manager a call or send us an email and we will activate this for you

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Our customers love this feature because it helps improve their work/life balance AND it offers the flexibility and control they need in their business.

Block Anonymous Callers Benefits

Avoid Sales Calls

Keep your business running smoothly


Give you control back of your time.

Stop Unwanted Calls

Stops unwanted or harassing calls

Block Anonymous Callers – Frequently Asked Questions

How much does it cost?2021-04-07T14:14:19+00:00

No charge. In 2021, BT were charging £6.58 a month for this service.

What will happen if I withhold my number when calling someone with Anonymous Call Reject?2021-04-07T14:15:08+00:00

A message will notify the blocked caller that the person they are calling is not accepting anonymous calls. We´ll ask them to redial without withholding their  number.

Will companies forward a ‘number unavailable’ message instead of ‘number withheld’ to get around Anonymous Call Reject?2021-04-07T14:15:36+00:00

No. The rules within the CLI (Calling Line Identification) Code of Practice don’t let them do it. Any telephone company not abiding by this rule would be in breach of their telecommunications licence, and liable to action from Ofcom (Office of Communications).

What are the potential security and safety concerns with the “Block Anonymous Callers” Service?2021-04-07T14:16:00+00:00

Many public services such as the police force, the DSS, hospitals, fire brigades and public utilities will not be able to contact customers who use the “Block Anonymous Callers” Service. This is due to the configuration of their private switchboards. They are trying to find a solution.

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