A business telephone system is any of a range of a multiline telephone system typically used in business environments, encompassing systems ranging from small key systems to large scale private branch. A business telephone system differs from simply using a telephone with multiple lines in that the lines used are accessible from multiple telephones or “stations in the system, and that such a system often provides additional features related to call handling.

A business with staff working from different offices need:

• A single point of contact through the telephone network
• To be able to transfer calls internally to each office and to remote offices
• Any office to be able to answer the incoming calls
• Multiple incoming calls
• Interface with VOIP, (Voice Over IP), and PSTN, (Public Service Telephone Network) Trunks
• Auto Attendant
• Call accounting
• Call waiting
• Voicemail for each extension
• Direct Inward Dialing
• Music on Hold
• Dialing Rules based on extension/number called