Is your company considering a voice over Internet Protocol (VoIP) system? If so, there are at least two options to consider: hosted VoIP and VoIP Private Branch eXchange (PBX). This PDF gives you a high-level view of how each of these options fares on service maintenance, features, upfront costs, and extras, among other considerations, so you can gauge which is the right one for your business. Download it now.
abstract of network security on voip thesis