2
. Master/Sub-station
Is
Master-station
number
changed
while
Sub-station
number
remains
unchanged
?
,NO
.YES
NO
N
e
w
Registration
?
YES
Sub-station
number
Master-station
number
Ascertain
d
ia
l
to
n
e
Ascertain
signal
tone
N
e
w
registration
finished
YES
NO
Release
?
• YES
Sub-station
number
Sub-station
number
A
s
c
e
rt
a
in
signal
to
n
e
Ascertain
d
ia
l
to
n
e
Release
finished
?
NO
NO
YES
R
e
m
a
r
k
s
:
I
n
t
h
e
e
v
e
n
t
o
f
failure
t
o
touch
k
e
y
s
f
o
r
corrent
dialing,
touch
"
C
"
k
e
y
to
ascertain
d
i
a
l
t
o
n
e
a
n
d
re-start
f
r
o
m
t
h
e
beginning.
Sub-station
n
u
m
b
e
r
N
e
w
Master-station
number
Ascertain
s
ignal
tone
Registration
o
f t
h
e
c
h
a
nges
finished
?
YES
NO
Is
Sub-station
number
changed
while
Master-station
number
remains
unchanged
o
r i
s
Master-station
number a
ls
o
changed
?
r
YES
Previous Sub-station
number
P
re
v
io
u
s
Sub-station
number
Ascertain
signal
tone
Ascertain
dial
tone
N
e
w
Sub-station
n
u
m
b
e
r
N
e
w
Master-station
number
Ascertain
d
ia
l
to
n
e
Ascertain
signal
t
o
n
e
RETURN
NO
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