VoIP phones utilize packet-switched Voice over Internet Protocol (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 VoIP phone calls is that unlike regular long-distance calls, phone calls made through a VoIP phone service are free – there are no fees beyond the cost of your Internet access.
Also referred to as online phones or Internet phones, a VoIP phone can be a physical telephone with built-in IP technology and an RJ-45 Ethernet connector instead of the RJ-11 phone connector found in standard phones, or it can be a voice-capable computer that uses VoIP hardware such as MagicJack or VoIP software like Skype. This flexibility makes it possible for VoIP phone calls to function as Internet phone-to-phone, Internet phone-to-PC, PC-to-PC or PC-to-phone calls.
See The Difference Between VoIP and PSTN Systems in the Did You Know? section of
- VoIP telephone
Voice over Internet Protocol, or VoIP, telephone products connect to VoIP, or Internet telephony, systems, which use packet-switched telephony to transmit calls over the Internet as opposed to the circuit-switched telephony used by the traditional Public Switched Telephone Network (PSTN). VoIP telephones look and largely function like standard phones, but they have built-in IP technology […]
- volatile memory
Memory that loses its contents when the power is turned off. All RAM except the CMOS RAM used for the BIOS is volatile. ROM, on the other hand, is nonvolatile.
The tape volume serial number or VOLSER is the method used to uniquely identify a tape volume. The VOLSER is specified in the tape label, which is the first set of information contained on the tape. [Source: Audit Serve]
- voltage regulator
(n.) A small device or circuit that regulates the voltage fed to the microprocessor. The power supply of most PCs generates power at 5 volts but most microprocessors require a voltage below 3.5 volts. The voltage regulator’s job is to reduce the 5 volt signal to the lower voltage required by the microprocessor. Typically, voltage […]
A fixed amount of storage on a disk or tape. The term volume is often used as a synonym for the storage medium itself, but it is possible for a single disk to contain more than one volume or for a volume to span more than one disk.