Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
4-80
Polycom, Inc.
The
Siren 22
audio algorithm provides CD-quality audio for better clarity and less listener
fatigue with audio and visual communication applications.
Siren 22
requires less computing
power and has much lower latency than alternative wideband audio technologies.
The SirenLPR audio algorithm provides CD-quality audio for better clarity and less listener
fatigue with audio and visual communication applications.
In
SVC conferences
, the system supports SAC (Scalable Audio Coding) audio algorithm.
Guidelines
•
Siren 22,
G.719
and
Siren 22Stereo
are supported with
MPM+
and
MPMx
cards.
•
Siren 22
and
G.719
are supported in both mono and stereo.
•
Stereo is supported in
H.323
calls only.
•
Siren 22
is supported by Polycom HDX endpoints, version 2.0 and later.
•
G.728
is supported with both
MPM+
and
MPMx
cards and in
H.323
,
SIP
and
ISDN
environments.
•
SirenLPR
is enabled by default and can be disabled by setting the system flag,
ENABLE_SIRENLPR
, to
NO
.
•
SirenLPR
is supported:
—
With
MPMx Cards
only.
—
In IP (H.323, SIP) calls only.
—
In CP and VSW conferences.
—
With
Polycom CMAD
and
HDX
“
Canyon 3.0.1
” endpoints.
—
For mono audio at audio line rates of 32Kbps, 48Kbps and 64Kbps.
—
For stereo audio at audio line rates of 64Kbps, 96Kbps and 128Kbps.
SIP Encryption
The
ENABLE_SIRENLPR_SIP_ENCRYPTION
System Flag
enables the
SirenLPR
audio
algorithm when using encryption with the
SIP
protocol.
The default value of this flag is
NO
meaning
SirenLPR
is disabled by default for
SIP
participants in an encrypted conference. To enable
SirenLPR
the
System Flag
must be added
to
system.cfg
and its value set to
YES
.
Mono
The
Siren 22
,
G.719
and
SirenLPR
mono audio algorithms are supported at the following bit
rates:
Table 4-17
Siren22, G.719 and SirenLPR Mono vs Bitrate
Audio Algorithm
Minimum Bitrate (kbps)
Siren22 64k
Siren22 48K
Siren22_32k
G.719_64k
384
G.719_48k
Содержание RealPresence 2000
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