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Call Screening Business Cases

It is known that some operators use Call Screening services which only prevent subscribers from the calls initiated by their blacklisted numbers. Customers have the option of blocking one or more numbers, as well as calls from particular countries. However, spam calls are not that easy to handle. Fraudsters generally have a bunch of sim cards, thus can call again and again from different numbers. So, a solution that solely depends on personal blacklists does not provide a comprehensive solution. Operators need network-based solutions for call screening that prevent fake calls in a mobile terminating way by utilizing Intelligent Networks.

  • For domestic calls, the determination of 'whether the subscriber is blacklisted across the nation or not' is made through Fraud identification. If the subscriber number is in the FRAUD lists, the call will be terminated. Fraudulent numbers within a country are in databases of all operators regardless of the served operator, so regulators do not be queried for this. The fraud number list can be updated manually with the GUI interface and by script via standard interfaces like Rest API.

Through the use of a fake or invalid phone number that is displayed when making calls, callers can conceal their identity. A spoof number on a call display could be a random string of digits or it could resemble the number of a real business or individual unrelated to the caller.

  • If there is no caller id or the caller id is alphanumeric, incoming calls from domestic and international numbers will be disconnected. According to the different caller id lengths, caller id contents, etc., calls can be cleared. For MO calls, MT calls, and interconnect calls, this feature shall be applicable. When determining whether the caller id is present or absent, the number of digits for the number types specified in the Numbering Regulation is taken into consideration.

In order to increase the likelihood that the call recipient will take the call and trust the caller, scammers will alter the caller ID to make it appear that the call is coming from a local or well-known phone number, a business, or a government agency. A substantial part of this kind of fraud comprises the inbound international calls with local CLI.

  • Network examination is handled for roaming status check with the purpose of detecting calls made by subscribers who pretend to be inland but are actually abroad. By Provisioning examination, a certain set of subscriber registrations are checked such as early call forwarding settings and IMS/TAS registrations.

Defne Call Screening’s unique criteria to block calls are listed below:

  • Calls coming from blacklisted numbers

  • Calls with invalid caller id.

  • Fraud calls coming from abroad (International interconnects incoming calls)

  • Frequent calls

  • Fraud calls coming from inland

  • Outgoing calls from subscribers who have no voice subscription

  • Calls of subscribers who have barred services

  • Calls of subscribers whose number is not aligned with the numbering plan

  • Calls if there is no such subscriber in the served operator

Defne Call Screening is Cloud Native, Kubernetes orchestrated. So it comes along with reduced development and release timeframes, optimized costs, increased software scalability and availability, and flexibility in multi-cloud environments.


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