Allows subscribers being automatically transferred to the additional line without the intervention of the operator/registrar.
Auto-attendant also allows the subscriber making connection with the operator, dialling the number “0”. The auto-attendant usually introduces a business telephone system, for instance, mini-ATC.
Viettel Group is one of leading telecom service providers in the world with over 50 million subscribers. Wireless Intelligence has ranked Viettel Group as the 19 th out of 784 biggest telecom service providers in the world regarding the number of subscrib
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