Version 6.8 303 Mediant 2600 E-SBC
User's Manual 19. Coders and Profiles
Parameter Description
Web: Transcoding Mode
CLI: transcoding-mode
[IpProfile_TranscodingMode]
Defines the voice transcoding mode (media negotiation) for this
SIP entity.
[0] Only if Required = (Default) Transcoding is done only when
necessary. Many of the media settings (such as gain control)
are not implemented on the voice stream. The device forwards
RTP packets transparently (RTP-to-RTP), without processing
them.
[1] Force = Transcoding is always done on the outgoing leg.
The device interworks the media between for this SIP entity (as
both legs have different media capabilities), by implementing
DSP transcoding. This enables the device to receive capabilities
that are not negotiated between the SIP entities. For example, it
can enforce Gain Control to use voice transcoding even though
both legs have negotiated without the device's intervention
(such as Extension coders).
Notes:
To implement transcoding, you must configure the number of
required DSP channels for transcoding (using the
MediaChannels parameter). Each transcoding session uses two
DSP resources.
The corresponding global parameter is TranscodingMode.
Allowed Media Types
CLI: sbc-allowed-media-types
[IPProfile_SBCAllowedMediaTy
pes]
Defines media types permitted for this SIP entity. The media type
appears in the SDP 'm=' line (e.g., 'm=audio'). The device permits
only media types that appear in both the SDP offer and this
configured list. If no common media types exist between the SDP
offer and this list, the device drops the call.
The valid value is a string of up to 64 characters. To configure
multiple media types, separate the strings with a comma, e.g.,
"media, audio" (without quotes). By default, no media types are
configured (i.e., all media types are permitted).
Web: Allowed Coders Group ID
CLI: sbc-allowed-coders-group-
id
[IpProfile_SBCAllowedCodersG
roupID]
Assigns an Allowed Coders Group to this SIP entity. This defines
audio (voice) coders that can be used for this SIP entity.
To configure Allowed Coders Groups, see Configuring Allowed
Audio Coder Groups on page 359.
For a description of the Allowed Coders feature, see ''Restricting
Coders'' on page 331.
Web: Allowed Video Coders
Group ID
CLI: sbc-allowed-video-coders-
group-id
[IPProfile_SBCAllowedVideoCo
dersGroupID]
Assigns an Allowed Video Coders Group to this SIP entity. This
defines permitted video coders when forwarding video streams to
the SIP entity. The video coders are listed in the "video" media type
in the SDP (i.e., 'm=video' line). For this SIP entity, the device uses
only video coders that appear in both the SDP offer and the
Allowed Video Coders Group ID.
By default, no Allowed Video Coders Group is assigned (i.e., all
video coders are allowed).
To configure Allowed Video Coders Groups, see Configuring
Allowed Video Coder Groups on page 360.
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