Configuring Rfc 2833 Payload; Configuring Rtp Base Udp Port - AudioCodes Mediant 4000 SBC User Manual

CHAPTER 15 Media
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To configure jitter buffer using the Web interface:
1. Open the RTP/RTCP Settings page (Setup menu > Signaling & Media menu > Media folder
> RTP/RTCP Settings). The relevant parameters are listed under the General group, as
shown below:
2. Set the 'Dynamic Jitter Buffer Minimum Delay' parameter (DJBufMinDelay) to the minimum
delay (in msec) for the Dynamic Jitter Buffer.
3. Set the 'Dynamic Jitter Buffer Optimization Factor' parameter (DJBufOptFactor) to the
Dynamic Jitter Buffer frame error/delay optimization factor.
4. Click Apply.

Configuring RFC 2833 Payload

You can configure the RFC 2833 payload.
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To configure RFC 2833 payload:
1. Open the RTP/RTCP Settings page (Setup menu > Signaling & Media tab > Media folder >
RTP/RTCP Settings).
2. Configure the following parameters:
● 'RTP Redundancy Depth' (RTPRedundancyDepth) - enables the device to generate RFC
2198 redundant packets.
● 'RFC 2833 TX Payload Type' (RFC2833TxPayloadType) - defines the Tx RFC 2833
DTMF relay dynamic payload type.
● 'RFC 2833 RX Payload Type' (RFC2833RxPayloadType) - defines the Rx RFC 2833
DTMF relay dynamic payload type.
● 'RFC 2198 Payload Type' (RFC2198PayloadType) - defines the RTP redundancy packet
payload type according to RFC 2198.
3. Click Apply.

Configuring RTP Base UDP Port

You can configure the range (pool) of local UDP ports from which the device allocates ports to
media (RTP, RTCP, and T.38) channels (legs). The maximum range of UDP ports is from 6,000
through to 65,535.
The consecutive port offset from the RTP port for RTCP and T.38 traffic is one and two,
respectively. For example, if the voice session uses RTP port 6000, the device allocates ports
6001 and 6002 for RTCP and T.38, respectively. However, you can configure the device to use the
same port for RTP and T.38 packets, by configuring the T38UseRTPPort parameter to 1.
Within the port range, the device allocates the UDP ports per media channel (leg) in "jumps"
(spacing) of 4 (default), 5, or 10, configured by the UdpPortSpacing parameter. For example, if the
port range starts at 6000 and the UDP port spacing is 10, the available ports are 6000, 6010, 6020,
6030, and so on. Within the port range, the device assigns these ports randomly to the different
media channels. For example, it allocates port 6000 to leg 1, port 6030 to leg 2, and port 6010 to leg
3.
You can configure the starting port (lower boundary) of the port range (default is 6000), using the
BaseUDPPort parameter. Once configured, the port range is according to the following equation:
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Mediant 4000 SBC | User's Manual