VoIP and Unified Communications: Internet Telephony and the Future Voice NetworkЭлектронная книгаVoIP and Unified Communications: Internet Telephony and the Future Voice NetworkавтораWilliam A. FlanaganРейтинг: 0 из 5 звезд0 оценокСохранить VoIP and Unified Communications: Internet Telephony and the Future Voice Network на потом