Overview
ABSTRACT
Voice on IP is a technology which allows for the diffusion of digitized voices on IP networks and thus communication between IP telephones. The aim of this article is to prove how vastly the VoIP has revolutionized the existing architectures in this domain. Indeed, these technological advances have allowed access to fixed telephony on circuit, high-speed Internet connection (ADSL), as well as to mobile telephony and Internet (via mobile networks such as EDGE). The challenges of this technology are also detailed such as interoperability cases, quality or network issues due to mobility, safety issues, etc. Finally, the VoIP is replaced into the context of new converging architectures (new generation network, fixed-mobile convergence).
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Jérôme PONS : Former 3GPP standardization delegate for Orange, France Telecom
INTRODUCTION
Voice over IP (VoIP) is a technology for transporting digitized voice over an IP network, and for establishing communications between IP telephones or softphones. The use of an analog telephone connected to a VoIP converter box or Internet telephony gateway is also covered.
The first part of this dossier provides a state-of-the-art overview of the architectures in place to access, on the one hand, fixed telephony over circuit (from home or the company), low-speed Internet (from home with a 56K modem) and high-speed Internet (from home with an ADSL modem or the company intranet), and on the other hand, mobile telephony and mobile Internet via the mobile network (GSM/GPRS/EDGE and UMTS/HSPA). We'll also look at the challenges involved in migrating to VoIP, particularly in terms of interoperability, quality of service, security and continuity of service linked to mobility. In order to open up new perspectives for VoIP, we will place it in the context of new convergent architectures, with fixed-mobile convergence (FMC) and I-WLAN, UMA/GAN and VCC architectures, on the one hand, and the replacement of circuit-switched transport networks by "all-IP" in the context of TISPAN Release 1 and LTE/SAE architectures, on the other.
The second part
The third part
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Voice on IP: Internet, fixed and mobile
Evolution of the telephone system
Bibliography
Voice over IP protocols
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