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Description:The features: 1) One handset for both PSTN and Internet calls 2) Lowest rates for calls to any regular (mobile or land-line) phone 3) Easy use of standard home phones for Internet calls 4) Automatic switching between PSTN and Internet phone calls 5) Three-way conference calling between PSTN and VoIP calls 6) Compatible with any analog POTS phone 7) Compatible with DECT, 2.4G, 900M, or other cordless phone 8) Full-duplex and echo-free sound quality 9) Auto detection and switching of incoming PSTN or VoIP calls 10) Define a default call method (VOIP or PSTN) 11) Complies with VoIP standards (SIP, H.232) as well as all other proprietary protocols through seamless integration with third-party soft phone offerings 12) Compact, low-profile design If you need, you could contact me by MSN.