Voice over IP

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Voice over IP

(communications)
(VoIP) Any technology providing voice telephony services over IP, including CODECs, streaming protocols and session control. The major advantage of VoIP is lower cost, by avoiding dedicated voice circuits.

Currently VoIP is being deployed on internal corporate networks, and, via the Internet, for low cost (and low quality) international calls. It is also used for telephony applications such as voice and fax mail.

The ITU standard is H.323, which is a whole suite of protocols, while the IETF has developed the much simpler SIP to solve the session control problem and MGCP/Megaco to solve the gateway problem.
References in periodicals archive ?
The airtime transfer service enables Zantel customers to be able to recharge their phones using multiple channels such as phone-to-phone, web-to-phone and Point of Sale (POS)-to-phone.
TransferTo prepaid airtime transfers are performed in real-time, and are convenient and readily available through a number of multiple channels including POS-to-Phone, Phone-to-Phone, and Web-to-Phone," a press release said.
TELECOMWORLDWIRE-31 October 2001-1st Quote launches web-to-phone insurance service (C)1994-2001 M2 COMMUNICATIONS LTD http://www.m2.com
Other features include a multiprocessor architecture that allows between 8,000-14,000 calls to be processed simultaneously, fully redundant power supplies and fans and support for next-generation services such as VoIP, fax over IP, ICD with SS7 call control, web-to-phone and wireless 3G services.
This proprietary, battle-hardened, Java-based Web-to-phone software can be deployed on virtually any portal or commercial Web site to provide PC-to-phone or PC-to-PC telephony service.
The PhoneBridge works with all VoIP services whether it's phone-to-phone, PC-to-phone, enhanced web-to-phone applications or video.