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Sicsophone: A Low-delay Internet Telephony Tool
RISE - Research Institutes of Sweden, ICT, SICS.ORCID iD: 0000-0001-8338-5513
2003 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The end to end delay is a critical factor in the perceived quality of service for Voice over IP applications. Sicsophone is a complete VoIP system that couples the low level features of audio hardware with a standard jitter buffer playout algorithm. Using the sound card directly eliminates intermediate buffering as well as providing fine control over timers needed by a soft real-time application such as VoIP. A statistical based approach for inserting packets into audio buffers is used in conjunction with a scheme for inhibiting unnecessary fluctuations in the system. We also present mouth-to-ear delay measurements for selected VoIP applications and show that several hundreds of milliseconds can be saved by using the techniques described in this paper. A prototype for both UNIX and Windows platforms has been implemented, demonstrating that our system adapts to network conditions whilst maintaining low delays.

Place, publisher, year, edition, pages
Belek, Turkey: IEEE , 2003, 10. p. 189-195
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:ri:diva-23685OAI: oai:DiVA.org:ri-23685DiVA, id: diva2:1042762
Conference
29th Euromicro Conference
Available from: 2016-10-31 Created: 2016-10-31 Last updated: 2018-01-14Bibliographically approved

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