AudioCodes E-SBC User Manual page 469

CHAPTER 19 Coders and Profiles
Parameter
'RTP Redundancy Depth'
rtp-redundancy-depth
[IpProfile_
RTPRedundancyDepth]
Gateway
Note: These parameters are applicable only to the Gateway application.
'Early Media'
early-media
Mediant 1000 Gateway & E-SBC | User's Manual
Description
If you configure the parameter to a "prefer" option, the
outgoing SDP offer contains two medias which are the
same except for the "c=" field. The first media is the
preferred address type (and this type is also on the session
level "c=" field), while the second media has its "c=" field
with the other address type. Both medias are grouped by
ANAT. For example, if the incoming SDP contains two
medias, one secured and the other non-secured, the device
sends the outgoing SDP with four medias:
■ Two secured medias grouped in the first ANAT group,
one with IPv4 and the other with IPv6. The first is the
preferred type.
■ Two non-secured medias grouped in the second ANAT
group, one with IPv4 and the other with IPv6. The first
is the preferred type.
Note:
■ The parameter is applicable only when the device offers
an SDP.
■ The IP addressing version is determined according to
the first SDP "m=" field.
■ The feature is applicable to any type of media (e.g.,
audio and video) that has an IP address.
■ The corresponding global parameter is
MediaIPVersionPreference.
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.
Note:
■ When enabled, you can configure the payload type,
using the RFC2198PayloadType parameter.
■ For the Gateway application, the RTP redundancy
dynamic payload type can be included in the SDP, by
using the EnableRTPRedundancyNegotiation
parameter.
■ The corresponding global parameter is
RTPRedundancyDepth.
Enables the Early Media feature for sending media (e.g.,
ringing) before the call is established.
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