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DeVry University- Chicago - JULY '12 | ||
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 | Switching to VoIP: A Solutions Manual for Network Professionals (1st Edition) by Theodore Wallingford, Ted Wallingford Paperback, 504 Pages, Published 2005 ISBN-10: 0-596-00868-6 / 0596008686 ISBN-13: 978-0-596-00868-0 / 9780596008680 More and more businesses today have their receive phone service through Internet instead of local phone company lines. Many businesses are also using their internal local and wide-area network infrastructure to replace legacy enterprise telephone networks. This migration to a single network carrying | |