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Chapter 11 – IP Service Settings
11-8
Parameter Description
Type
DiffServ and Precedence are two methods for encoding
packet priority. The priority set here for audio and video
packets should match the priority set in the network
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 queueing greatly increases the latency and
jitters 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, in the value range of 0~5.
Note:
Precedence is the default mode as it is capable of
providing 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.
Figure 11-7 IP Network Services – Ports