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14.1.2 Video Codecs
Video codecs are used by video phones to compress the amount of information sent between
two devices. Video codecs encode video signals into digital signals and decode the digital
signals back into video signals. The X6004 does not perform any video coding, it does support
the passthrough of the following video codecs.
Table 35 Voice Codecs Supported
CODEC
DESCRIPTION
H.261
This is an ITU (International Telecommunication Union) video coding standard. H.261 was
designed in 1990 and is considered the first practical video coding standard. The data rate
of the coding algorithm is able to operate between 40 kbps and 2 Mbps. H.261 was targeted
primarily to work over circuit-switched networks and has since been superseded by more
efficient video coding standards.
H.263
This video codec is based closely on the H.261 standard, but as a general rule requires half
the bandwidth to achieve the same quality video. H.263 is capable of streaming video at
bandwidths as low as 20 kbps to 24 kbps.
H.264
This video codec is video compression technology that falls under the MPEG-4 standard,
also known as MPEG-4 Part 10. H.264 can provide excellent video quality at bandwidth
from 40 Kbps upwards.
14.2 Authority Group
Use this screen to set up authority groups on the X6004. To access this screen, click
Configuration > PBX > Extension Management > Authority Group.
Figure 103 Configuration > PBX > Extension Management > Authority Group
Each field is described in the following table.
Table 36 Configuration > PBX > Extension Management > Authority Group
LABEL
Authority Group
Extension
Number
Machine ID
Group Name
X6004 User's Guide
DESCRIPTION
This screen allows you to see which authority groups are configured on the X6004
and it allows you to search extensions configured on the X6004.
Type an extension number and click Query to see if an extension number is
already configured on the X6004 and to view its details. See
page 128
for details.
This field indicates the Machine ID of the X6004 on which this authority group was
created.
This is the name of the authority group.
Chapter 14 Authority Group
Section 14.2.1 on
127
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