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Note added at 1 hr (2023-06-13 14:07:52 GMT)
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Что значит подменный номер на Авито?
Подменный номер в объявлении на Авито видят потенциальные покупатели вместо вашего настоящего номера. Сервис анализирует все звонки и производит их переадресацию на ваш номер. То есть, когда потенциальный покупатель позвонит на подменный номер, он будет переадресован на настоящий номер. В свою очередь, спам звонки система заблокирует и на ваш номер они не поступят.
https://creatmedia.ru/objavlenija/chto-takoe-podmennyj-nomer...

The core of the present invention is based on the original telephone number of the member user, and also a computer controlled management system (herein referred to as "masked telephone service system") that generates a virtual telephone number that replaces the original telephone number. Masked Phone Service System). In operation of the service system, this substitute number (herein referred to as the "mask telephone number") corresponds to the original telephone number of the user and also masks it.
https://patents.google.com/patent/KR20060006067A/en

Masked numbers are primarily used to keep communication private between two/several parties while safeguarding their phone numbers. With masked phone numbers, users are connected through a third-party (proxy) phone number instead of direct contact between the two parties through their actual phone number to bridge the call.

Put simply; phone number masking is the process of using a customized IP voice caller ID to hide your phone number when you call or text someone.

The need for phone number masking is becoming increasingly important in today’s business landscape. It is primarily because of the increase in the rate of cybercrime, which has enhanced the need to safeguard customers’ personal information.

The reasons for masking cell phone numbers can also vary from people being concerned about their privacy and wishing to keep their personal information private from the caller to protect themselves from potential harassment on the phone.
https://justcall.io/blog/how-to-mask-phone-number.html