Sicsophone: A low-delay Internet telephony tool
2003 (English)In: PROCEEDINGS OF THE 29TH EUROMICRO CONFERENCE - NEW WAVES IN SYSTEM ARCHITECTURE, 2003, 189-195 p.Conference paper (Refereed)
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
2003. 189-195 p.
, EUROMICRO CONFERENCE - PROCEEDINGS, ISSN 1089-6503
packet voice, playout buffer adaption, operating systems
Telecommunications Computer Science
IdentifiersURN: urn:nbn:se:kth:diva-14295ISI: 000185703900027ISBN: 0-7695-1996-2OAI: oai:DiVA.org:kth-14295DiVA: diva2:332076
29th EUROMICRO Conference BELEK ANTALYA, TURKEY, SEP 01-06, 2003
QC 201008022010-08-022010-08-022010-08-02Bibliographically approved