Dialogic 6.2 - Manual (Page 291)

Ground Start Signaling
November 2009 291
Figure 31. FXO Ground Start – Incoming Call Timing Diagram
IISD
N
SM
I
M
E
S
S
A
G
ES
:
L
4
L
3
m
AL
ER
T
IN
G
_
R
E
Q
U
EST o
r L
4
L
3
m
PR
OG
R
ESS
_
R
EQU
EST
L
4
L
3
m
C
O
N
N
E
C
T
_
R
EQU
EST
L
3L4
m
P
RE
_
S
E
IZE
L
3L4
m
S
E
T
U
P
_I
N
D
IISD
N
T
IM
E
R
S
:
hoo
k
tim
er_
onh
oo
k
_
rls
m
o
dif
ie
d_in
_
rl
s
_
ti
m
e
r
hoo
k
tim
er_
onh
k
_
m
o
d
_
in
_rls
c
ritic
al_
tim
e
r
hoo
k
tim
er_
m
a
x
m
a
k
e
hoo
k
tim
er_
m
in
m
a
k
e
hoo
k
tim
er_
m
a
x
br
eak
hoo
k
tim
er_
m
in
br
eak
fir
s
t_
in
d
ig
it
_
tim
e
r
dpt
im
e
r_im
m
e
d
_de
la
y
h
o
o
kti
m
e
r_
o
ffh
o
o
k_
in
se
iz
e
R
E
C
E
IVE H
O
O
K
SW
IT
C
H
, FXS:
A
Bi
t
B
Bi
t
T
R
A
N
SM
IT
H
O
O
K
SW
IT
C
H
, FXO:
A
Bi
t
B
B
it
(ig
nor
ed)
NO
TE
: Thi
s
d
iag
ram
is
de
s
ign
ed t
o
give
t
he r
e
a
der
a ge
ner
al un
de
rs
ta
n
d
ing
of
t
h
e
s
equ
en
c
e
of
ev
en
ts
f
o
r t
h
is
r
o
b
bed
bit
pr
ot
oc
o
l ov
er t
im
e
. Th
e t
im
e
rs
and
s
pac
in
g on
t
h
is
gr
ap
h ar
e no
t
p
ro
por
ti
ona
l t
o
t
h
e
ac
tu
a
l ev
ent
s
t
h
at
oc
c
u
r.
Re
vis
e
d 10
-No
v
-9
8
Re
vis
ion
1.
3
D
P
D
ig
it "
2
"
D
P D
ig
it "1
"
RE
CEIVED B
ITS,
TRANSMITTED
Revised
20-Oct-03
Rev 1.4