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procedures:
a) GES incoming circuit-mode call initiation -
4.8.6.1.2.2.1;
b) GES incoming bi-directional setup - 4.8.6.1.2.2.2:
c) GES incoming C channel establishment -
4.8.6.1.2.2.3;
d) GES incoming terrestrial completion - 4.8.6.1.2.2.4;
e) GES incoming C channel maintenance -
4.8.6.1.2.2.5; and
f) GES incoming C channel release guard -
4.8.6.1.2.2.6.
4.8.6.1.2.2.1 C;ES incoming circuit-mde call initiation.
Upon receipt from an AES of an "abbreviated access request
- telephone" CM-LIDU with a unique application reference
number, GES circuit-mode services shall request GES management
to assign C channel resources at the C channel Q number
value as per Table 4-43.
Note.- This is to say that the Q number of the C channel
shall be inferred from the Q number used in the initial circuitmode
call signalling at the link layer:
GES circuit-mode services shall then do the following:
a) if a "call progress - channel release" CM-LIDU is
received prior to GES management assigning C
channel resources, GES circuit-mode services shall
terminate all activities for the call; or
b) if C channel resources are not available, then GES
circuit-mode services shall forward to the link layer a
"call progress - call attempt result" CM-LIDU via the
P channel. GES circuit-mode services shall then await
tG9 seconds for the potential receipt of a repetition of
the original "abbreviated access request - telephone"
CM-LIDU at the current application reference number.
If such an additional CM-LIDU is received from AES
circuit-mode services, 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
"abbreviated access request - telephone" CM-LlDUs (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 "abbreviated access request - telephone"
CM-LIDUs might be received, prior to C channel unit
Annex 10 - Aeronautical Telecommunications Volume ZIZ
autivarion, as a resulr of the series transmission of several
such CM-UDUs by the AES. The redundant CM-LIDUS can
be ignored without efect.
4.8.6.1 22.2 GES irtcoming bi-directional setup. Where
required elsewhere in 4.8, GES circuit-mode services shall
perform routing analysis of the network-ID specified in the
"abbreviated access request - telephone" CM-LDU while
simultaneously performing the following:
Note I.- Routing analysis is considered to be a GESspec$
c procedure wherein the network-ID parameter is used
to idenrib the specijic group of voice circuits whiclz interconnect
the GES with the desired terrestrial circuit-switched
voice network
Note 2.- The logic in this subsection initiates terrestrial
call completion while simultaneously iniriating the establislzment
of the C channel.
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-LIDLJ has been forwarded to the link
layer, GES circuit-mode senrlces shall again forward
the'"C channel assignment" CM-LIDU to AES circuicmode
services: or
b) if a "call information - service address" CM-LlDU is
not received within tG1 I seconds after the latest "C
channel assignment" CM-LIDU has been forwarded to
the link layer, GES circuit-mode services shall perform
the GES incoming release guard procedure defined in
4.8.6.1.2.2.6; or
c) if a "call progress - channel release" CM-LIDU is
received, GES circuit-mode services shall await the
termination of the C channel from-aircraft carrier. If
the from-aircraft carrier is not present, terminate all
activities for the call; otherwise, if the C channel fromaircraft
carrier terminates within tG24 seconds after
receipt of the "call progress - channel release"
CM-UDU, GES circuit-mode services shall terminate
all activities for the call. I f the camer does not
　
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