phone system (telephone system)
A phone system comprises multiple telephones used in an interconnected fashion that allows for advanced telephony features such as call handling and transferring, conference calling, call metering and accounting, private and shared voice message boxes, and so on. A telephone system can range from just a few telephones in a home or small business up to a complex private branch exchange (PBX) system used by mid-sized and large businesses.
Phone systems can function over the Public Switched Telephone Network (PSTN), over the Internet (Internet telephony or VoIP), or over a combination of the two. Business telephone systems can also be delivered as a hosted service (typically referred to as a centrex), which can free companies from having to invest in costly equipment.
See The Difference Between VoIP and PSTN Systems in the Did You Know… section of
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Mobile VoIP refers to mobile handsets that have been integrated into an existing VoIP, or Internet telephony, network, typically via a Wi-Fi or 3G/4G cellular network that the mobile device is connected to. In most cases, mobile phone users will need to download a service provider’s software application to their smartphone before being able to […]
- Internet phone
Internet phones, or IP phones, use packet-switched VoIP, or Internet telephony, to transmit telephone calls over the Internet as opposed to the circuit-switched telephony used by the traditional Public Switched Telephone Network (PSTN). The advantage to Internet phone calls is that unlike regular long-distance calls, online phone calls are free — there’s no fees beyond […]
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A form of business VoIP services where the VoIP equipment, servers and services are hosted by the VoIP provider, which manages calls and routes them to and from the subscriber’s existing telephony system and equipment. Hosted VoIP is also frequently referred to as managed VoIP and can save companies from the potentially expensive costs of […]