Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
116
make
the
address
and
port
translation
for
the
voice
communication.
First,
the
calling
starts
from
the
SIP
Phone
#1
to
the
SIP
server.
Then
the
SIP
server
invites
the
SIP
Phone
#2
and
finally,
the
SIP
Phone
#1
talks
to
the
SIP
Phone
#2,
as
shown
in
above
diagram.
Special
AP
&
ALG
Setting
The
Special
AP
setting
allows
some
applications
require
multiple
connections.
The
ALG
setting
allows
user
to
Support
some
SIP
ALG,
like
STUN.
Enable
Special
AP
and
Virtual
Computer
Go
to
Basic
Network
>
NAT/
Bridging
>
Special
AP
&
ALG
tab
Special
AP
&
ALG
tab
Item
Value setting
Description
Special
AP
The
box
is
checked
by
default
Check
the
Enable
box
to
activate
this
NAT
function
ALG
Enable
The
box
is
checked
by
default
Check
the
Enable
box
to
activate
this
NAT
function
Save
N/A
Click
the
Save
button
to
save
the
setting
Undo
N/A
Click
Undo
to
cancel
the
settings