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terminate within the same tG24 second period, GES
circuit-mode services shall terminate all activities for
the call at the end of the period; or
Note.- The status of an unterminated fromaircrafr
carrier should be posted to a monitoring
function.
d) if a "call information - service address" CM-LIDU is
received within tGll seconds after C channel unit
activation, GES circuit-mode services shall send "call
progress - test" CM-LDUs every tGlO seconds
indefinitely; or
e) if routing analysis indicates that completion of the call
is blocked due to congestion in either the GES switching
equipment or the forward circuit group leading to
the terrestrial network, GES circuit-mode services shall
stop forwarding "call progress -testm CM-LIDUs and
then forward to the link layer six "call progress -
channel release" CM-LIDUS via the C channel
sub-band. GES circuit-mode services shall then
perform the GES incoming release guard procedure
defined in 4.8.6.1.2.2.6: or
f) if routing analysis is successful in obtaining a forward
circuit to the terrestrial network, GES circuit-mode
services shall forward an "AMS(R)S call origination"
event (FI.TE 18) to the intenvorking intexface with the
terrestrial network. If a "call information - service
address" CM-LIDU has already been received, GES
circuit-mode services shall then perform the GES
incoming terrestrial completion procedure defined in
4.8.6.1.2.2.4: otherwise GES circuit-mode services
shall await establishment of the C channel by performing
the GES incoming C channel establishment procedure
defined in 4.8.6.1.2.2.3.
4.8.6.1.2.2.3 GES incoming C channel establishment.
Where required elsewhere in 4.8, GES circuit-mode services
shall do the following while awaiting the establishment of the
C channel:
Note.- Within this subsection, it is possible that signalling
tvent,s might be received from the terrestrial network. Therefore,
if any telephony intenvorking events are received at the
interworking inre$ace wid1 the terrestrial network, they should
be held in queue for interpretation by logic specified in
subsequent subsections.
a) if an additional "abbreviated access request - telephone"
CM-LIDU at the current application reference
number is received from AES circuit-mode services
within tGll seconds after the latest "C channel
assignment" CM-LIDU has been forwarded to the link
layer, GES circuit-mode services shall again forward
the "C channel assignment" CM-LIDU to AES circuitmode
services; or
b) if a "call progress - channel release" CM-LIDU is
received within tG 1 1 seconds of C channel unit activation,
GES circuit-mode services shall stop forwarding
''call progress - test" CM-LIDUs and forward a
"clear forward event (FlTE 22) to the interworking
interface. (If additional "call progress - channel
release" CM-LIDUs are received, GES circuit-mode
services shall ignore them.) GES circuit-mode services
shall then wait tG24 seconds after receipt of the "call
progress - channel release" CM-LIDU for the
C channel from-aircraft camer to terminate. If the
from-aircraft carrier is not present, terminate all ' .
Part I Annex 10 - Aeronautical Telacommunications
activities for the call; otherwise, if the C channel fromaircraft
camer terminates within the tG24 second
period, GES circuit-mode services shall terminate all
activities for the call. If the C channel from-aircraft
canier does not terminate within the same period, GES
circuit-mode services shall terminate all activities for
the call at the end of the period; or
Note.- The status of the ~ntenninated fromaircraft
carrier should be posted to a monitoring
function.
c) if a "call information - service address" CM-LIDU is
not received within tGll seconds after the latest "C
channel assignment" CM-LIDU has been forwarded to
the link layer, GES circuit-mode services shall forward
a "clear forward" event (FITE 22) to the interworlcing
interface and perform the GES incoming release guard
procedure defined in 4.8.6.1.2.2.6; or
d) if a "call information - service address" CM-LDU is
received within tGll seconds after C channel unit
activation, GES circuit-mode services shall send "call
progress - test" CM-LIDUs every tG 10 seconds
indefinitely and perform the GES incoming terrestrial
completion procedure defined in 4.8.6.3.2.2.4.
4.8.6.1.2.2.4 GES incoming terrestrial completion. While
　
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