Installation & Operation Manual 774 Document # LTRT-92224
Mediant 8000
43.16.3 Transcoding Modes
The device supports the configuration of the voice transcoding mode (media
negotiation) between the two SBC legs. The device can be configured to perform
transcoding only when necessary. Typically, the SBC application passes RTP packets
transparently (RTP-to-RTP) between the two user agents. If the device is configured
to always perform transcoding, then transcoding is performed on the outgoing SBC leg
and the device's SBC application interworks the media by implementing Media
transcoding (since both legs have different media capabilities).
In the SBC application, forced transcoding of voice in an SBC session allows the
device to receive capabilities that are not negotiated between the SBC legs. For
example, if you wish to force Gain Control on the SBC session to use voice
transcoding, even though both sides of the session have negotiated without SBC
intervention (for example coder extension).
Note: To implement transcoding, you must configure the number of required DSP
channels used for transcoding via Number of Media Channels parameter in the SIP
Configuration screen. Each transcoding session uses two DSP resources.
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