RealPresence Collaboration Server (RMX) 800s/Virtual Edition Administrator’s Guide
Polycom®, Inc.
224
Audio Algorithm Support
The Collaboration Server supports the following audio algorithms in AVC conferences: G.711, G.722,
G.722.1, G.722.1C, G.729A, Polycom Siren 7 (in mono), Siren14, Siren 22 (in mono or stereo) and
SirenLPR.
Polycom’s proprietary Siren 22 and industry standard G.719 audio algorithms are is supported for
participants connecting with Polycom endpoints.
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.
Audio Algorithm Support Guidelines
●
Siren 22 is supported in both mono and stereo.
●
Stereo is supported in H.323 calls only.
●
Siren 22 is supported by Polycom HDX and Group series endpoints, version 2.0 and later.
●
SirenLPR is enabled by default and can be disabled by setting the system flag,
ENABLE_SIRENLPR
, to
NO
.
●
SirenLPR
is supported:
In IP (H.323, SIP) calls only.
In CP conferences.
With
Polycom CMAD
and
HDX
3.0.1 and later
and Group series 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, and SirenLPR mono audio algorithms are supported at the following bit rates
:
Siren22, and SirenLPR Mono vs Bitrate
Audio Algorithm
Minimum Bitrate (kbps)
Siren22 64k
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