Dialogic 6.2 - Manual (Page 311)

Loop Start Signaling
November 2009 311
Figure 43. FXS Loop Start – Incoming Call Timing Diagram
II
SD
N
SM
I M
ESS
A
G
E
S
:
L
4L3
m
A
LER
T
IN
G
_
R
E
Q
U
EST
o
r L
4L3
m
P
R
O
GR
ESS_R
E
Q
U
ES
T
L
4L3
m
C
O
N
N
E
C
T
_
R
EQU
E
ST
L3
L4mP
R
E_SE
IZ
E
L
3L4
m
S
E
T
U
P
_I
N
D
II
S
D
N
T
IM
E
R
S
:
h
ook
ti
m
e
r_
onh
ook
_r
ls
modi
fi
e
d_i
n
_
rl
s
_
ti
m
e
r
h
ook
ti
m
e
r_
onh
k
_
m
o
d
_
in
_r
ls
fi
rs
t_
indi
gi
t_
ti
m
e
r
d
p
ti
m
e
r_
im
med_
del
a
y
R
E
C
E
IV
E
HO
OK
S
W
IT
CH,
FX
O
:
A
Bi
t
B
Bi
t
T
R
A
N
S
M
IT
H
O
O
K
S
W
IT
C
H
, F
X
S
:
N
O
T
E
:
N
o
di
gi
ts
ar
e c
o
lle
c
ted on t
h
e
n
ear
en
d
in
t
h
is
mode
.
A
Bi
t
B B
it
N
O
T
E
:
Th
is
di
agr
a
m
i
s
des
ig
ned
t
o
g
ive
th
e
r
e
ade
r a
gen
er
al
un
ders
tand
ing
of
t
he
s
e
que
nc
e o
f
even
ts
f
o
r t
h
is
r
obb
ed
b
it
pr
o
toc
ol
ove
r t
im
e
.
Th
e t
im
e
rs
an
d s
p
a
c
ing
on
th
is
gr
a
ph
ar
e
not
p
ropo
rt
io
nal
t
o
t
he
ac
tu
al
even
ts
t
hat
oc
c
u
r.
R
e
vi
s
e
d 10-N
o
v-
9
8
R
e
vi
s
ion
1.
3
R
ECE
IV
ED BITS,
TRANSM
IT
TED
Revis
ed