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Chapter 11 –
IP Network Services
11-8
Parameter Description
routers.
•
Differv: Select when the network router uses Differv for
priority encoding. If this option is selected, enter values in
the "Audio" and "Video" fields, The value range is 0~63.
Note:
If you select DiffServ but your router does not
support this standard, IP packets queue on the same
communication links with data packets. This non-prioritized
queuing greatly increases the latency and jitter in their
delivery and can negatively impact performance.
•
Precedence: Select this option when the network router
uses Precedence for priority encoding, or when you are
not sure which method is used by the router. Precedence
should be matched with "None" in the "Tos" field. If this
option is selected, enter values in the "Audio" and
"Video" fields, The value range is 0~5.
Note:
Precedence is the default mode, which can provide
priority services to all types of routers and is currently the
most common mechanism.
Audio / Video
You can prioritize audio and video IP packets to ensure that
all participants in the conference hear and see each other
clearly.
The recommended priority is 4 for audio and video to
ensure that the packet delay for both is the same, that
audio and video packets are synchronized, and to ensure
lip and audio synchronization (lip sync).
TOS
Select the Type of Service (ToS) that defines optimization
tagging for routing the conference audio and video
packets.
• Delay: The recommended default for video
conferencing; prioritized audio and video packets tagged
with this definition are delivered with minimal delay
• None: No optimization definition is applied. This is a
compatibility mode in which routing is based on
Precedence priority settings only. Select None if you do
not know which standard your router supports.
Ports
Users can set firewall-allowed ports that are used for multimedia conference
calls. In the "IP Network Services" interface, click "Ports" to configure the
port information.
IP Network Services – Ports
The table below explains the detailed meanings of these parameters.