Polycom 6000 - Manual (Page 22)

Administrator Guide for Polycom QDX 6000 System
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3. Select and configure these settings on the Bandwidth screen:
Configuring the System for Use with a Firewall or NAT
A firewall protects an organization’s IP network by controlling data traffic
from outside the network. Unless the firewall is designed to work with H.323
video conferencing equipment, you must configure the system and the
firewall to allow video conferencing traffic to pass in and out of the network.
Firewall Settings
Network Address Translation (NAT) network environments use private
internal IP addresses for devices within the network, while using one external
IP address to allow devices on the LAN to communicate with other devices
outside the LAN. If your system is connected to a LAN that uses a NAT, you
will need to enter the NAT Public (WAN) Address so that your system can
communicate outside the LAN.
Maximum
Transmission
Unit Size Specifies the Maximum Transmission Unit (MTU) size used in
IP calls. If the video becomes blocky or network errors occur,
packets may be too large; decrease the MTU. If the network is
burdened with unnecessary overhead, packets may be too
small; increase the MTU.
Enable PVEC Allows the system to use PVEC (Polycom Video Error
Concealment) if packet loss occurs.
Enable RSVP Allows the system to use Resource Reservation Setup Protocol
(RSVP) to request that routers reserve bandwidth along an IP
connection path. Both the near site and far site must support
RSVP in order for reservation requests to be made to routers
on the connection path.
Setting Description
Setting Description
Dynamic
Bandwidth Specifies whether to let the system automatically find the
optimum line speed for a call.
Maximum
Transmit
Bandwidth Specifies the maximum transmit line speed between 64 kbps and
the system’s maximum line rate.
Maximum
Receive
Bandwidth Specifies the maximum receive line speed between 64 kbps and
the system’s maximum line rate.