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IP Phone / SIP Phone Solution > IP Phone / SIP Phone Document's Aastra 51i Aastra 53i Aastra 55i Aastra 57i Aastra 7400 IP Terminals Aastra Dialog 4000 IP Telephones Aastra Dialog 5446 IP Premium SIP phone A VoIP phone uses voice over IP (VoIP) technologies allowing telephone calls to be made over an IP network such as the Internet instead of the ordinary PSTN system. Get Connected no Matter where you are!