Linksys, a division of Cisco Systems, Inc., is the recognized global leader in VoIP, Wireless and Ethernet networking for home, SOHO (Small Office, Home Office) and small business users. Based in Irvine, California, Linksys specializes in products and solutions that provide effortless and economical sharing of broadband Internet connections, files, printers, digital music, videos, photos and gaming over a wired or wireless network. These reliable, easy-to-use, world-class products are backed with award-winning technical support, setting the standard for excellence in the consumer and small business.
VoIP
Voice over Internet Protocol (VoIP) is a protocol optimized for the transmission of voice through the Internet or other packet switched networks. VoIP takes analog audio signals from a regular phone and turns them into digital data that can be transmitted over the Internet. With this method, there are many benefits over a traditional phone network:

The IP PBX System from Linksys marries the rich feature set of high-end PBX telephone systems with the convenience and cost advantages of Voice over IP. It has common voice system features such as an auto-attendant, three way call conferencing, intercom, music on hold, call-forwarding and much more. Their systems open up access to the benefits of VoIP, including low cost long distance service, telephone number portability, and one network for both voice and data.