ZyXEL Communications IP PBX X6004 User Manual
Page 297
Chapter 18 Outbound Line Group
X6004 User’s Guide
297
Codec Setting
Select the type of voice coder/decoder (codec) that you want this
extension to use when communicating with the X6004. The following
codecs (shown in highest quality to lowest quality order) are supported
by the X6004:
• G.711 a-law (typically used in Europe)
• G.711 u-law (typically used in North America and Japan)
• G.729
• G.723.1 - you must activate support for this codec in the
Configuration > PBX > Server Configuration > Server >
Global screen.
• G.726
for more information on voice codecs.
When two SIP devices start a SIP session, they must agree on a codec.
If these SIP extensions are assigned to videophones, you must specify
the video codecs used for video calls. The X6004 allows the following
video codecs to passthrough:
• H.261
• H.263
• H.264
• MP4
for more information on video codecs.
Codec Pool
This column indicates the codec types not used for these extensions.
You can add a codec type to be used for these extensions by
highlighting it and clicking the Right button.
Codec List
This column indicates the codec types used by these extensions. You
can organize the priority of the codecs by highlighting it and clicking the
Up or Down buttons to move the codec higher or lower in priority. The
SIP extensions attempt to use the higher priority codecs first and try
the lower priority codecs next. You can remove a codec type from being
used from these extension by highlighting it and clicking the Left
button.
Apply
Click this to save your changes.
Cancel
Click this to set every field in this screen to its last-saved value.
Table 96 Configure a SIP Trunk (continued)
LABEL
DESCRIPTION