出版社：International Association for Computer Information Systems
摘要：Several factors become apparent when a business is compelled to evaluate the decision to go with VoIP and a unified communications model or continue with one of the four conventional telephony systems model solutions. VoIP brings with it high start-up costs typically coupled with a multi- month payback period. However, these costs are followed by an on- going total cost of operation (TCO) savings. These costs and savings impact the operations of the computer network which now would include, data; and operation of telephony and video-conferencing systems. VoIP supports unified communications across the enterprise. The purpose of this exploratory research is to examine the system tradeoffs and the cost differences among the Final-Four Models of conventional telephony systems in relation to converting to VoIP.
关键词：VoIP; Telephony Information Systems;CENTREX; PBX; IP-PBX; Telephony Regulations
