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VoIP profile configuration task list
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SmartWare Software Configuration Guide
40 • VoIP profile configuration
Figure 80. Jitter and dejitter buffer
The dejitter buffer delays incoming packets so it can present them to the decompression algorithm at fixed
intervals. It will also fix any out-of-order packets by looking at the sequence number in the RTP packets. Such
buffering has the effect of smoothing packet flow, and increasing the resiliency of the codec to packet loss,
delayed packets, and other transmission effects. The negative side of dejitter buffering is that it can add signifi-
cant delay. The dejitter buffer size is configurable and can be optimized for given network conditions, the size
is usually set to be a multiple of the expected packet arrival time in order to buffer an integral number of pack-
ets. It is not uncommon to see dejitter buffer settings around 80 ms for each direction.
Node
Node
Voice Packets
Voice
Decoder
Buffer
x
x + dx
x
Node
Node
Network
Содержание SmartWare R.3.20
Страница 553: ...553 Appendix A Terms and definitions Chapter contents Introduction 554 SmartWare architecture terms and definitions 554...
Страница 559: ...559 Appendix B Mode summary Chapter contents Introduction 560...
Страница 566: ...566 Appendix D Internetworking terms acronyms Chapter contents Abbreviations 568...
Страница 571: ...571 Appendix E Used IP ports available voice codecs Chapter contents Used IP ports 573 Available voice codecs 574...