User's Manual

Avaya Branch Gateway Manager 10.0 Page 187
15-601011 Issue 29r (Friday, November 02, 2012)B5800 Branch Gateway
Configuration Settings: System
5.3.14 Codecs
This tab is used to set the codecs available for use with all IP (H.323 and SIP) lines and extensions and the default order
of codec preference.
· Avaya H.323 telephones do not support G.723 and will ignore it if selected.
· For systems with H.323 lines and extensions, one of the G.711 codecs must be selected and used.
· G.723 is not supported by Linux based systems.
· The number of channels provided by an IP500 VCM 32 or IP500 VCM 64 card, up to a maximum of 32 or 64
respectively, depends on the actual codecs being used. This also applies to IP500 VCM 32 V2 and IP500 VCM 64
V2 cards. The following table assumes that all calls using the VCM use the same codec.
Codec
IP500 VCM 32
IP500 VCM 32 V2
IP500 VCM 64
IP500 VCM 64 V2
G.711
32
64
G.729a
30
60
G.723
22
44
G.722
30
60
When paging, always use only one codec (the preferred). It is the system administrator's responsibility to ensure all the
phones in the paging group support the codec.
Usability
· Mergeable: These settings are mergeable. Changes to these settings do not require a reboot of the system.
Configuration Settings
· Available Codecs
This list shows the codecs supported by the system and those selected as usable. Those codecs selected in this list
are then available for use in other codec lists shown in the configuration settings. For example the adjacent
Default Selection list and the individual custom selection list on IP lines and extensions.
· ! WARNING:
Removing a codec from this list automatically removes it from the codec lists of any individual lines and
extensions that are using it.
· The available codecs in default preference order are: G.711 A-Law, G.711 U-Law, G.729 and G.723.1.
Note that the default order for G.711 codecs will vary to match the system's default companding setting.
G.723.1 is not supported on Linux based systems. The G.722 64K codec is also supported on systems with
IP500 VCM, IP500 VCM V2 or IP500 Combo cards but it not used by default.
Default Codec Selection
By default, all IP (H.323 and SIP) lines and extensions added to the system have their Codec Selection setting set
to System Default. That setting matches the codec selections made in this list. The buttons between the two lists
can be used to move codecs between the Unused and the Selected parts of the list and to change the order of the
codecs in the selected codecs list.