AudioCodes Mediant 1000

Version 7.2 419 Mediant 1000B Gateway & E-SBC
User's Manual 19. Coders and Profiles
Parameter Description
a=group:ANAT 2 4
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 parameter is applicable to both Gateway and SBC calls.
 The corresponding global parameter is
MediaIPVersionPreference.
RTP Redundancy Depth
rtp-redundancy-depth
[IpProfile_RTPRedundancyDe
pth]
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 only: The RTP redundancy dynamic
payload type can be included in the SDP, by using the
EnableRTPRedundancyNegotiation parameter.
 The corresponding global parameter is RTPRedundancyDepth.
Gateway
Early Media
early-media
[IpProfile_EnableEarlyMedia]
Enables the Early Media feature for sending media (e.g., ringing)
before the call is established.
 [0] Disable (default)
 [1] Enable

Digital: The device sends a SIP 18x response with SDP,
allowing the media stream to be established before the call is
answered.

Analog: The device sends a SIP 183 Session Progress
response with SDP instead of a 180 Ringing, allowing the
media stream to be established before the call is answered.