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Billion 800VGT Router
Advanced – Parameters
VoIP
through
IP
Interface:
IP
Interface
decides
where
to
send/receive
the
VoIP
traffic.
Options
include:
ipwan
and
iplan.
An
easy
way
to
select
the
interface
option
is
to
check
the
location
of
the
SIP
server.
If
it
is
located
somewhere
on
the
Internet,
then
select
ipwan.
If
the
VoIP
SIP
server
is
on
the
local
network
then
select
iplan.
Voice
Frame
Size:
Voice
Frame
size
can
be
set
anywhere
between
10ms
and
60ms.
The
function
of
Voice
Frame
Size
is
how
many
milliseconds
the
Voice
packets
will
be
queued
for,
before
being
sent
out.
Billion 800VGT
Router
The
ideal
setting
is
to
have
the
same
frame
size
for
both
Caller
and
Receiver.
PSTN
Auto-fallback:
Whenever
VoIP
SIP
response
is
an
error
code
that
matches
the
codes
in
the
Edit
section,
the
VoiP
calls
will
automatically
fall
back
to
a
PSTN.
Click
Edit
to
add
or
remove
codes.
Be
sure
that
the
codes
are
separated
by
a
comma
(,).
For
more
information
about
SIP
response
codes,
please
click
on
to
link
to
http://voip-info.org/wiki/view/sip+response+codes
where
you
can
find
out
the
meaning
of
each
error
code.
Advanced – PSTN Environment
Adjustment
The
PSTN
Environment
Adjustment
options
will
help
you
to
adjust
the
on
hook
and
off
hook
voltage
detection
values
for
your
environment.
The
actual
levels
are
determined
by
your
environment
including
the
number
and
type
of
telephones
used.
The
default
values
provided
are
suitable
for
the
South
African
PSTN
network,
and
there
should
not
be
modified.
If,
however,
you
are
connecting
the
line
port
to
a
PABX,
and
you
experience
problems
with
placing
calls,
then
you
may
wish
to
modify
these
parameters.
Note:
ON
HOOK
means
hung
up.
To
take
your
phone
OFF
HOOK,
lift
the
receiver
then
press
Hook/Flash
until
you
hear
your
normal
PSTN
dial
tone,
not
your
VoIP
dial
tone.
Wait
several
seconds
and
then
press
Check
Level.
You
should
check
the
OFF
HOOK
value
for
each
telephone
you
have
connected
to
this
device.
Set
the
OFFHOOK
voltage
to
the
lowest
setting
registered
for
all
your
telephones,
e.g.
if
your
telephones
return
values
of
4,
5
and
7
then
you
should
set
your
OFFHOOK
voltage
to
4.
Note:
The
detected
values
will
not
automatically
be
set
by
the
Check
Level
function;
you
must
enter
the
lowest
level
detected
after
testing
all
your
telephones.
103
Chapter
4:
Configuration