Auto-attendant
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.
SIP protocol was made within IETF (Internet Engineering Task Force) – organization occupied with establishing Internet standards and general standards concerning TCP/IP protocols.
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