A multiplexing scheme for H.323 voice-over-IP applications

Author

Sze, H.P. ; Liew, Soung C. ; Lee, Jack Y B ; Yip, Danny C S

Author_Institution

Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Shatin, China

Volume

20

Issue

7

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

1360

Lastpage

1368

Abstract

Voice communications such as telephony are delay sensitive. Existing voice-over-IP (VoIP) applications transmit voice data in packets of very small size to minimize packetization delay, causing very inefficient use of network bandwidth. This paper proposes a multiplexing scheme for improving the bandwidth efficiency of existing VoIP applications. By installing a multiplexer in an H.323 proxy, voice packets from multiple sources are combined into one IP packet for transmission. A demultiplexer at the receiver-end proxy restores the original voice packets before delivering them to the end-user applications. Results show that the multiplexing scheme can increase bandwidth efficiency by as much as 300%. The multiplexing scheme is fully compatible with existing H.323-compliant VoIP applications and can be readily deployed.

Keywords

Internet telephony; packet switching; H.323 voice-over-IP applications; IP packet; Internet telephony; VoIP; bandwidth efficiency; demultiplexer; multiplexing scheme; telephony; voice communications; voice packets; Bandwidth; Delay; Helium; Internet telephony; Lifting equipment; Multiplexing; Payloads; Quality of service; Telecommunication traffic; Wide area networks;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/JSAC.2002.802064

Filename

1031907