Improving VoIP Quality Using Silence Description Packets in the Jitter Buffer

Younchan JUNG  J. William ATWOOD  Hans-Jurgen ZEPERNICK  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.11   pp.3719-3721
Publication Date: 2008/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.11.3719
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Internet
VoIP,  QoS,  playout algorithm,  jitter buffer,  

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The basic playout scheme (BAS) is designed not to take into account network impairment information during silence periods. We propose a jitter-robust playout mechanism (RST), which uses silence description (SID) packets. The lateness loss percentages are compared between the BAS and the RST algorithms. We report that the accuracy of the playout schedule calculation in the BAS is getting worse as the previous silence interval increases and our proposed RST algorithm is more effective in removing high jitter than the BAS. Under high jitter Internet conditions, the accuracy of the estimates and therefore the resulting of VoIP playout quality can be significantly improved by using the SID packets in the playout schedule recalculation.