AudioCodes Mediant 3000, Руководство пользователя

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Version 6.6 735 Mediant 3000
User's Manual 53. Configuration Parameters Reference
Parameter Description
Web: RTP Redundancy Depth
EMS: Redundancy Depth
[RTPRedundancyDepth]
Enables the device to generate RFC 2198 redundant packets. This
can be used for packet loss where the missing information (audio)
can be reconstructed at the receiver's end from the redundant data
that arrives in subsequent packets. This is required, for example, in
wireless networks where a high percentage (up to 50%) of packet
loss can be experienced.

[0] 0 = (Default) Disable.

[1] 1 = Enable - previous voice payload packet is added to
current packet.

[2] 2 = Previous two voice payload packets are added to the
current packet.

[3] 3 = Previous three voice payload packets are added to the
current packet.

[4] 4 = Previous four voice payload packets are added to the
current packet.

[5] 5 = Previous five voice payload packets are added to the
current packet. To use this RTP redundancy level, you need to
set the DSPVersionTemplateNumber parameter to 4 or 7. The
coders that support this redundancy level include:

DSPVersionTemplateNumber = 4 (all coders)

DSPVersionTemplateNumber = 7 (only G.729 and iLBC
coders)
Notes:

When enabled, you can configure the payload type, using the
RFC2198PayloadType parameter.

The RTP redundancy dynamic payload type can be included in
the SDP, by using the EnableRTPRedundancyNegotiation
parameter.

This parameter can also be configured in an IP Profile.
Web: Enable RTP Redundancy
Negotiation
[EnableRTPRedundancyNeg
otiation]
Enables the device to include the RTP redundancy dynamic
payload type in the SDP, according to RFC 2198.

[0] Disable (default)

[1] Enable
When enabled, the device includes in the SDP message the RTP
payload type "RED" and the payload type configured by the
parameter RFC2198PayloadType.
a=rtpmap:<PT> RED/8000
Where <PT> is the payload type as defined by
RFC2198PayloadType. The device sends the INVITE message
with "a=rtpmap:<PT> RED/8000" and responds with a 18x/200 OK
and "a=rtpmap:<PT> RED/8000" in the SDP.
Notes:

For this feature to be functional, you must also set the
parameter RTPRedundancyDepth to 1 (i.e., enabled).

Currently, the negotiation of “RED” payload type is not
supported and therefore, it should be configured to the same
PT value for both parties.
Web: RFC 2198 Payload Type
EMS: Redundancy Payload
Type
[RFC2198PayloadType]
Defines the RTP redundancy packet payload type according to
RFC 2198.
The range is 96 to 127. The default is 104.