4 relations: Business telephone system, Call forwarding, Extension (telephone), Voicemail.
Business telephone system
A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging from small key telephone systems to large-scale private branch exchanges.
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Call forwarding
Call forwarding, or call diversion, is a telephony feature of some telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available.
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Extension (telephone)
In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another.
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Voicemail
A voicemail system (also known as voice message or voice bank) is a computer-based system that allows users and subscribers to exchange personal voice messages; to select and deliver voice information; and to process transactions relating to individuals, organizations, products and services, using an ordinary telephone.
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Redirects here:
DnD - Do Not Disturb (Telecommunication), DnD – Do Not Disturb (Telecommunication).
References
[1] https://en.wikipedia.org/wiki/Do_Not_Disturb_(telecommunications)