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(Voice Over IP) A digital telephone service that uses the Internet for transport, as well as private IP networks. "IP" stands for "Internet Protocol." In order that calls can originate and terminate from regular telephones, connections to the public telephone network (PSTN) are also provided. Telephone companies, cable companies and dedicated providers offer VoIP calling for a fixed monthly fee or low per-minute charge. Customers must have existing Internet access.

Telephony Protocols: SIP/H.323 and Skype
VoIP uses two telephony protocols for handling connections (see SIP and H.323), and most VoIP systems support both. Skype uses its own protocol (see Skype).

Handset Based
Regular phones can be used with many VoIP services by plugging them into an analog telephone adapter (ATA) from the VoIP provider or third party. The ATA converts the phone signals to IP packets. Native IP phones are also available.

Software Only = Softphone
VoIP may be entirely software based, which uses an app in a mobile device or a computer equipped with microphone and speakers. Typically free if both sides are on devices; calls to a regular telephone are per minute. In 1995, VocalTec Communications introduced the first VoIP service in the U.S.; entirely software based (see softphone). Skype is a very popular softphone-based VoIP service (see Skype). See SIP provider.

VoIP Features
Voicemail, caller ID, call forwarding and a softphone option (if not a softphone-only service) are typically part of a VoIP package. Phone numbers with area codes outside of one's own home area may also be an option (see virtual phone number). See IP telephony for more details and history of the technology.

References in periodicals archive ?
Matthew Hodgson (Technical lead) said: "From today anyone can run their own Matrix server and clients, and developers can use the client API to odd IM and VolP to new or existing apps and access the wider Matrix ecosystem.
It is secured by VolP which makes it impossible for android users to take screenshots while the iOS users will get a notification if the screenshots are taken.
As business networks increasingly carry converged traffic (VolP, video, data), MPLS has emerged as the most efficient way to meet the special delivery needs of each type of data.
[18.] Barbosa KBF, Volp ACP, Hermsdorff HHM, Navarro-Blasco I, Zulet MA, Martinez JA, et al.
Too often designers jump directly to a specific VolP phone or real-time location system as a solution to the issue.
Make backup plans for VolP networks, as they can be disabled if the power goes out.
She is certified on numerous platforms including VolP, Managed Internet Solutions, MPLS, Ethernet, Business Continuity and Wireless Solutions.
In these individuals, even though a larger amount of adipose tissue favors the increase in insulinemia, this does not result in increased satiety (VOLP et al., 2008).
PTA informed that grey monitoring system had been made functional from early October 2013 Monitoring system had the capability to block all those IPs and it conveyed the Volp traffic and it was also not included in the whitelist of PTA.
Until recently, VoIP was completely banned in the United Arab Emirates, and Skype, one of the most popular worldwide VolP providers, is still banned.
Ricky Volp, research economist with the USDA economic research service, said historically, when the price of field corn goes up by 50 percent, the price of retail food on average goes up about 1 percent.
Just as we have the potential to overload ourselves in our personal means of communication, we must be careful to design and plan for proper and formal communication in the healthcare space, or we risk falling into the same communication traps we see with pagers and VolP phones.