D-Link introduced a Wi-Fi phone, designed in the shell that combines the ability to connect to a wireless network and to use the benefits of IP-telephony in one portable device. Thanks to this Wi-Fi VoIP-phone home and business users get a significant reduction in expenditures for local and long distance calls comparing to standard phone service.
Citel PBXgateways are installed at the central PBX location, and EXTenders are deployed at branch offices, call centers, or at home offices over managed IP connections, DSL, cable, or analog circuits