[Speex-dev] SDP parameters for DTX and VBR modes
Alexander.Chemeris at sipez.com
Tue Feb 19 15:05:33 PST 2008
Two questions about SDP usage with Speex:
1) How to anounce thet DTX is enabled?
2) What is default value of 'cng' option? In latest draft it is
defined as following:
cng: comfort noise generation - either 'on' or 'off'. If off then
silence frames will be silent; if 'on' then those frames will be
filled with comfort noise.
3) What is the relation between 'vbr' and 'cng' options?
Is there unacceptable combinations of them?
In lastest draft 'vbr' is defined as following:
vbr: variable bit rate - either 'on' 'off' or 'vad' (defaults to
off). If on, variable bit rate is enabled. If off, disabled. If
set to 'vad' then constant bit rate is used but silence will be
encoded with special short frames to indicate a lack of voice for
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