User's Manual

The AUDIO_CODECN parameters specifies the order of preference for audio codecs. If there
are no valid entries provided, then the parameter uses the default list of codecs. If you enter
a codec that is not recognized by the IP Deskphone, then the parameter considers the codec
as a blank entry. To remove a codec from the list, you must first blank the entry, or change it
to an invalid codec name in the Device Configuration file.
Codec preference selection on the IP Deskphone
The Audio Quality Settings screen on the IP Deskphone allows the user to select an exact
codec by name. This grants the user full control over the audio settings used for inbound and
outbound calls.
The list of codecs is populated with the names of the codecs provided during Device
Configuration. If a text descriptor is provided for a codec in the Device Configuration file, it
appears after the codec name. The Audio Codec Ordering screen allows the user to modify
the order of preference of the codecs. To change the list of available codecs, you must perform
an update through Device Configuration. The IP Deskphone creates the ordered list from the
list of codecs in the Device Configuration file. The user can reorder the list using the
Preferences menu. On subsequent Device Configuration updates, at start time, or other
updates, the ordered codec list of the user is synchronized with the list in the Device
Configuration file. This synchronization makes both lists equal. If the user creates an order that
is different from the one in the Device Configuration file, the IP Deskphone appends it to the
end of the list.
Codecs preferences on the IP Deskphone
The user cannot modify the text descriptors through the IP Deskphone; the text descriptors
can only be read by the user. After the system loads the Device Configuration file, the user
preference selections are synchronized with the system codecs specified in the Device
Configuration file. This ensures that the codecs available to the user are always set according
to user preferences.
If the user modifies the order through the IP Deskphone, then the user-defined order is saved
for the codecs that are defined as system codecs in the Device Configuration file. Codecs are
appended at the end of the list in their relative order from the Device Configuration file. Until
the user modifies the order of the codecs, the list of ordered codecs reflects the order specified
in the Device Configuration file.
The following table shows examples of the list of codecs provided by Device Configuration,
user configuration, and resulting list of codecs that the system uses for presentation and codec
negotiation purposes.
Audio codecs
248 SIP Software for Avaya 1100 Series IP Deskphones-Administration November 2012
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