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It is necessary that there be a call waiting mode if all 4 GSM numbers of the online store are busy. Where to google?
So that when a person calls, they say to him "Wait, you will be answered soon." Orient, please, what is the name of the scheme of the device or service? Where to google? Thanks
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This is a mobile call center service.
moskva.beeline.ru/business/products-and-solutions/...
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