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AEQ
PHOENIX ALIO
45
4.5. Coding algorithm selection.
See section 6.1.3.1 ("Coding selection") at "AEQ ControlPHOENIX" user’s manual.
Although AEQ recommends the use of
OPUS coding algorithms for most uses
(several different modes are available to
match almost any need), a coding
selection window can be accessed by
clicking on the "Select codec" button
located inside the "ENCODER" area of
the general configuration window, where
both OPUS modes and others provided
for compatibility can be found.
Note that the "DECODER" will be
automatically configured for the same
coding algorithm and mode.
However, when the interface
is IP and configured in any of
the SIP modes ("DIRECT
SIP"
or
"PROXY
SIP"),
particular coding algorithms
won’t
be
selected
and
connection "profiles" will be
defined instead, containing
one or more modes. This is
like that because SIP allows
the
participants
in
a
communication to negotiate
the coding algorithm, so the
one to be finally used will be
limited to those includes in
the selected profile.
This possibility allows the configuration of the parameters associated to the coding to be used in
Audio over IP networks basing on SIP protocol (Proxy SIP and Direct SIP modes). This option
simplifies the selection of the algorithm to be used in a communication, because most of the
codecs have several tens of encoding algorithms in order to have the higher compatibility with
other equipments.
When a communication is established using SIP signaling, the codec negotiates the use of the
first compatible encoding algorithm included in a list called SIP CODEC PROFILE. That’s why
you should put these algorithms in order of preference.
Each one of the stored entries includes an alphanumeric identifier and a list of algorithms to
use, organized in order of preference. There several preset profiles in the unit, grouped by
delay, quality… etc.
Profiles can be added, modified or deleted in the "Encoding Profile
Management (SIP)" screen, accessible from the "Tools" menu in
the upper Menu bar, described in paragraph 5.1.8 of "AEQ
ControlPHOENIX" user’s manual.