VoIP
ATA
with
router
function
User
Manual
31
Codec
A
CODEC
is
an
algorithm
for
taking
voice
or
video
and
compressing
the
information.
This
type
of
codec
combines
analog
‐
to
‐
digital
conversion
and
digital
‐
to
‐
analog
conversion
functions
in
a
single
chip.
The
Codec
is
used
to
compress
the
voice
signal
into
data
packets.
Each
Codec
has
different
bandwidth
requirement.
There
are
9
kinds
of
codec,
G.711/Ulaw,
G.711/Alaw,
G.729,
G.723(5.3k
/
6.3k
bps),
G.726(16K
bps),
G.726(24K
bps),
G.726(32K
bps),
G.726(40K
bps)
QoS
The
QOS
(Quality
Of
Service)
is
to
guarantee
that
the
SIP
and
RTP
should
be
transmitting
at
the
same
time
and
Data
couldn’t
influence
the
Voice
quality.
The
QOS
(Quality
Of
Service)
is
to
guarantee
that
the
Voice
and
Data
should
be
transmitting
at
the
same
time
and
Data
couldn’t
influence
the
Voice
quality.
When
TOS
bits
is
enabled,
it
will
guarantee
the
Voice
have
the
first
priority
pass
through
the
TOS
enable
devices.