VoIP
ATA
with
router
function
User
Manual
34
from
‐
32
to
31,
Loop
Current
Select
the
loop
current.
Polarity
Reversal
As
Callee
Answer
‐
Check
this
box
to
generate
line
polarity
reversal
while
the
remote
user
picks
up
the
phone
call.
As
Callee
On
‐
Hook
‐
Check
this
box
to
generate
line
polarity
reversal
while
the
remote
user
hangs
off
the
phone
call.