ZyXEL Communications IP PBX X6004 User Manual
Page 304
Chapter 18 Outbound Line Group
X6004 User’s Guide
304
Codec Setting
Select the type of voice coder/decoder (codec) that you want to use
when communicating with the trusted peer. 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 screen.
• G.726
for more information.
When two SIP devices start a SIP session, they must agree on a codec.
If the trusted peer uses 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.
Codec Pool
This column indicates the codec types not used for this trusted peer
connection. You can add a codec type to be used for these extensions
by highlighting it and hitting the Right button.
Codec List
This column indicates the codec types used for this trusted peer
connection. 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 hitting
the Left button.
Apply
Click this to save your changes and to apply them to the X6004.
Cancel
Click this to set every field in this screen to its last-saved value.
Table 99 Trusted Peer Configuration (continued)
LABEL
DESCRIPTION