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serviccs, GES circuit-mode services shall again forward
the "call progress - call attempt result" CM-LIDU;
otherwise, GES circuit-mode services shall terminate all
activities for the call after expiry of the initial tG9
second period.
Otherwise, GES circuit-mode services shall forward to the link
layer a "C channel assignment" CM-LDU. Simultaneously,
GES circuit-mode services shall request GES management to
activate the previously assigned C channel unit. Any redundant
"access request - telephone" CM-LIDUs (with an identical
application reference number) received prior to C channel unit
activation shall be ignored. GES circuit-mode services shall
then perform the GES incoming bi-directional setup procedure
defined in 4.8.6.1.2.2.2.
Note.- Redundant "access request - telephone" CMLIDUs
might be received, prior to C channel unit activatio?z,
as a result of the series transmission of several such CMLIDUs
by the AES. The redundant CM-LIDUS can be ignored
with,out effect.
4.8.6.1.2.2.2 GE.9 incoming bi-directional setup. Where
rcquired elsewhere in 4.8, GES circuit-mode services shall
perform routing analysis 01' the network-ZD specified in the
"access request - telephone" CM-LIDU while simultaneously
performing the following:
Note I.- Routing analysis is considered to be a GESspecific
~rocedurew herein the network-ID parameter is used
to identifr the specific group oj. voice circuits which interconnect
the GES with the desired terrestrial circuit-switched
voice network.
Note 2.- The logic in this subsection initiates terrestrial
call completion while simultaneously initiating the establishment
of the C channel.
a) if an additional "access request - telephone" CMLIDU
at the current application reference number is
received from AES circuit-mode services within tGZ1
seconds after the latest "C channel assignment" CMLLDU
has bcen forwarded to the link layer, GES circuitmode
services shall again forward the "C channel
assignment" CM-LIDU to S S circuit-mode services;
or
b) if a "call information - service address" CM-LIDU is
not received within tG1l seconds after the latest "C
channel assignment" CM-LIDU has been forwarded to
the link layer, GES circuit-mode services shall perfom
the GES incoming release guard procedure dcfined in
4.8.6.1.2.2.6; or
C) if a "call progress - channel release" CM-LDU is
received, GES circuit-mode services $;hall await the
termination of the C channel from-aircraft canier. If the
from-aircraft carrier is not present, terminate all
activities for the call; otherwise, if tlie C channel fromaircraft
carrier terminates within tG24 seconds after
receipt of the "call progress - channel release"
CM-LIDU, GES circuit-mode serviccs shall tenninate
all activities for the call. If [he carrier does not 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 from-aircraft
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-LIDUs 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 - test" CM-LDUs and then
forward to the link layer six "call progress - channel
release" CM-LIBUS via the C channel, sub-band. G%S
circuit-mode services shall then perfom 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 (FITE 18) to the interworkiilg interface 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; olherwise GES circuit-mode services shall
await establishment of the C channel by performing the
GES incoming C channel establishment procedure
dcfined in 4.8.6.1.2.2.3.
　
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