Abstract
Emerging markets are increasingly competitive under the heading of convergence and substitution, including device convergence, fixed-mobile convergence, fixed-mobile substitution, service convergence, VoIP (Voice over Internet Protocol) telephony substituting for circuit switched voice telephony, bundled offers of mobile, fixed, broadband and TV and, finally, truly unified communications and digital media services that are delivered irrespective of anytime, anywhere, and anyhow. With the increasing use of wireless networking, convergence technology combined with user mobility is expected to introduce a significant change in how and when people communicate, using a variety of new applications on ubiquitous wireless devices. This chapter aims to discuss VoIP over enterprise fixed mobile converged networks (FMCN) and points out some open issues. We first review VoIP basics including transport and signalling protocols, speech coding, and VoIP quality assessment model, followed by introducing enterprise FMCN architecture and service characteristics. Then we review the performance of VoIP over enterprise wireless networks and discuss voice over enterprise unified communications. Finally, several future directions including VoIP over femtocell, location/presence-enriched enterprise VoIP, and admission control in enterprise wireless network are briefly listed.
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