Past, Present and Future of IP Telephony

Author

Soares, Vasco N G J ; Neves, Paulo A C S ; Rodrigues, Joel J P C

Author_Institution

Super. Sch. of Technol., Polytech. Inst. of Castelo Branco, Castelo Branco

fYear

2008

fDate

June 29 2008-July 5 2008

Firstpage

19

Lastpage

24

Abstract

Since the late 90´s IP telephony, commonly referred to as Voice over IP (VoIP), has been presented as a revolution on communications enabling the possibility to converge historically separated voice and data networks, reducing costs, and integrating voice, data and video on applications. This paper presents a study over the standard VoIP protocols H.323, session initiation protocol (SIP), media gateway control protocol (MGCP), and H.248/Megaco. Given the fact that H.323 and SIP are more widespread than the others, we focus our study on them. For each of these protocols we describe and discuss its main capabilities, architecture, stack protocol, and characteristics. We also briefly point their technical limitations. Furthermore, we present the advanced multimedia system (AMS) project, a new system that aims to operate on Next Generation Networks (NGN) taking the advantage of its features, and it is viewed as the successor to H.323 and SIP.

Keywords

Internet telephony; multimedia communication; radio networks; signalling protocols; H.248-Megaco; IP telephony; advanced multimedia system; media gateway protocol; next generation networks; session initiation protocol; stack protocol; standard VoIP protocols H.323; voice over IP; Circuits; Communication switching; Communication system control; Costs; Hardware; Internet telephony; Local area networks; Multimedia systems; Next generation networking; Protocols; Advanced Multimedia System; H.323; Session Initiation Protocol; Voice over IP;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Theory, Reliability, and Quality of Service, 2008. CTRQ '08. International Conference on

Conference_Location

Bucharest

Print_ISBN

978-0-7695-3190-8

Electronic_ISBN

978-0-7695-3190-8

Type

conf

DOI

10.1109/CTRQ.2008.12

Filename

4561170