A Dynamic Redundant Audio Transmission in VoIP Systems

Mu Jung KIM  Kyung Huy LEE  Chul Hong KWON  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.6   pp.2056-2059
Publication Date: 2003/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
VoIP,  QoS,  RTP/RTCP,  redundant audio transmission,  

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To recover the lost packets in VoIP systems, we propose a dynamic redundant audio transmission mechanism that responds to network status. A receiver computes the QoS information using timestamps and sequence numbers in RTP headers and sends the information to a sender using the RTCP protocol. The sender transmits redundant audio packets to the receiver to recover the lost packets. Experimental results show that the rate of recovering the lost packets is 63% in case of consecutive packet loss and is 42% in case of non-consecutive packet loss.