z
Start
RTP
Port
/
End
RTP
Port
:
The
UDP
ports
used
by
CooVox
IPPBX
system
to
carry
RTP
voice
stream.Do
not
change
the
port
numbers
or
you
may
encounter
audio
issue
with
phone
calls.
z
DTMF
Mode
:The
DTMF
mode
specifies
how
touch
tones
will
be
transmitted
to
the
other
side
of
the
call.
Possible
values
for
this
field
are
rfc2833,
inband,
info,
and
auto.
z
Allow
Guest
:
This
setting
determines
if
anonymous
callers
are
permitted
to
place
calls
to
the
CooVox
IPPBX
system.
For
security
precautions
please
do
not
enable
this
option.
z
Max
Registration/Subscription
Time(sec)
:
Maximum
allowed
time
of
incoming
registrations
and
subscriptions
(seconds).
z
Min
Registration/SubscrptionTime(sec)
:
Minimum
length
of
registrations/subscriptions.
z
Default
Incoming/Outgoing
Registration
Time(sec)
:
Default
length
of
incoming/outgoing
registration.
NAT
Support
When
the
CooVox
IPPBX
system
is
behind
a
NAT
device
and
needs
to
communicate
to
the
outside.
It
needs
to
know
whether
it
is
talking
to
someone
"inside"
or
"outside"
of
the
NATted
network.
For
example,
if
you
are
going
to
deploy
remote
extensions
you
have
to
tell
the
CooVox
IPPBX
system
which
network
address/addresses
are
from
inside
and
which
are
from
outside.
Below
is
an
example
configuration.
z
External
IP
:
Your
static
public
IP
address
or
domain
name.
z
External
Host
:
This
issimilarto“ExternalIP”exceptthat
the
hostname
is
looked
up
every
"External
Refresh"
seconds(default
10’s).
z
External
Refresh(sec)
:
The
refresh
interval
of
the
“External
Host”.
z
Local
Network
Address
:
Your
local
network
address/addresses.
Notice
:
If
you
have
one
‐
way
audio
or
no
audio
issue
on
the
remote
extensions
then
this
most
probably
means
that
NAT
support
is
not
properly
configured.
Please
check
your
configurations
here.
Type
of
Service
Asterisk
supports
different
QoS
settings
at
the
application
level
for
various
protocols
on
both
signaling
and
media.
The
Type
of
Service
(TOS)
byte
can
be
set
on
outgoing
IP
packets
for
various
protocols.
The
TOS
byte
is
used
by
the
network
to
provide
some
level
of
Quality
of
Service
(QoS)
