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Voice Feature Guide 01

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The transmission quality on the IP network is not guaranteed. The interval at which packets are received from the remote end is not even, and the sequence of packets received may be different from the sequence that these packets are sent. As a result, the voice quality is degraded. Therefore, the jitter buffer (JB) is introduced to eliminate the jitter of the IP network. The basic idea of JB is that delay is introduced so that uneven and disordered RTP packets can be sequenced in the buffer and then sent to the TDM side. Figure 1-133 shows the JB implementation method.

The JB is classified into the dynamic JB and the static JB.

  • Dynamic JB: The buffer depth can be automatically adjusted based on network jitter conditions, so that the introduced delay is appropriate to process the jitter. The dynamic JB mainly applies to voice services.
  • Static JB: The buffer depth is fixed and cannot be changed based on network jitter conditions. The static JB mainly applies to data services, such as fax over IP (FoIP) and modem over IP (MoIP). This is because the modification of buffer depth may lead to packet loss, which has great adverse impact on data services.
Figure 1-133 JB implementation method


The dynamic JB and the static JB are supported. The adjustable range of the JB depth is 0 ms to 135 ms.

Updated: 2019-02-22

Document ID: EDOC1100067358

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