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1VoIP and Unified Communications. Internet Telephony and the Future Voice Network , William Flanagan A.
Translates technical jargon into practical business communications solutions This book takes readers from traditional voice, fax, video, and data services delivered via separate platforms to a… 5381.37 руб электронная книга2VoIP and Unified Communications. Internet Telephony and the Future Voice Network , William Flanagan A.
Translates technical jargon into practical business communications solutions This book takes readers from traditional voice, fax, video, and data services delivered via separate platforms to a… 5323.84 руб электронная книга