Polycom RealPresence Group Series Administrator's Manual page 80

Setting
Type of Service
Video
Audio
Control
OA&M
Maximum Transmission Unit Size
Maximum Transmission Unit Size Bytes
Enable Lost Packet Recovery
Polycom, Inc.
Description
Specifies the type of service (ToS), which lets you
prioritize packets sent to your system for video, audio,
Far End Camera Control (FECC), and OA&M:
• IP Precedence: Represents a priority level between
0 and 7.
• DiffServ: Represents a priority level between 0 and
63.
Note: If you enable AS-SIP and you select DiffServ,
the DSCP values for audio and video defined for the
negotiated call precedence level in the default network
domain for outbound calls override the Video and
Audio settings on this page. If you don't enable AS-
SIP, the system uses the Video and Audio values
defined here.
Specifies the IP Precedence or DiffServ priority level
for video RTP and associated RTCP traffic.
Specifies the IP Precedence or DiffServ priority level
for audio RTP and associated RTCP traffic.
Specifies the IP Precedence or Diffserv priority level
for control traffic on the following channels:
• H.323: H.225.0 Call Signaling, H.225.0 RAS, H.245,
and FECC
• SIP: SIP Signaling, FECC, and Binary Floor Control
Protocol (BFCP)
(The system enables FECC by Allow Other
Participants in a Call to Control Your Camera.)
Specifies the IP Precedence or Diffserv value for
traffic unrelated to video, audio, or FECC.
Specifies whether to use the default Maximum
Transmission Unit (MTU) size for IP calls or let you
select it.
Specifies the MTU size (in bytes) used in calls.
• If video quality is poor or you experience network
errors, packets might be too large. Decrease the
MTU.
• If the network is burdened with unnecessary
overhead, packets might be too small. Increase the
MTU.
If you enable this setting, the system uses the Lost
Packet Recovery (LPR) protocol to help compensate
for packet loss if it occurs.
Configuring Network Settings
78