VoIP Adaptor Driver Manufactures

Description extracted from Wikipedia:

date=September 2012Voice over Internet Protocol VoIP ), also called IP telephony , is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. The terms Internet telephony , broadband telephony , and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN), also known as plain old telephone service (POTS).