RTX Cordless DUALphone Phone Telephone VOIP Skype Call free of charge worldwide via Skype to other Skype users. All other calls are charged. 2-in-1 cordless telephone  Internet telephone and standard telephone in one. International and long distance calls at low rates with SkypeOut (requires purchase of SkypeOut credit online). Extra telephone line free of charge  simultaneous ordinary telephone and Internet calls. Ability to participate in Skype conference calls