ZyXEL Communications X6004 User Manual

 Chapter 14 Authority Group

X6004 User’s Guide

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. 

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 35   Voice Codecs Supported

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primarily to work over circuit-switched networks and has since been superseded by more 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. 

Table 36   Configuration > PBX > Extension Management > Authority Group

Authority Group

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.

Extension 

Number

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 

 for details.

Machine ID

This field indicates the Machine ID of the X6004 on which this authority group was 

created.

Group Name

This is the name of the authority group.