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c) if a "call. progress - channel release" CM-LIDU is
received, GES circuit-mode services shall stop
forwarding "call progress - test" CM-LIDUs and shall
forward a "clear fonvard event (FTE 22) to the
interworking interface. (If additional "call progress -
channel release" CM-LIDUs are received, GES circuitmode
services shall ignore them.) If the from-aircraft
carrier is not present, terminate all activities for the call;
otherwise, if the C channel from-aircraft carrier
terminates within tG14 seconds, GES circuit-mode
services shall terminate all activities for the call. If the
C channel from-aircraft camer 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 an idntenninated from-aircraj?
carrier should be posted to a monitoring function.
d) if an "address complete" event (BITE 5) or "sending
finished" event (BITE 27) are rcceived at the
interworking interface, GES circuit-mode scrvices shall
stop forwarding "call progress - test" CM-LIDUs. It
shall then forward to the link layer a "call progress -
call attempt result" CM-LIDU every tGlO seconds until
a positive "telephony acknowledge" CM-LIDU is
received. If a positive "telephony acknowledge" CMNote.-
At this point, circuit continuity is established LIDU is not received within tGll seconds of the
through the GES between the C channel and the terrestrial transmission of the first "call progress'- call attempt
network circuit. Call colrpletion across the terrestrial network result" CM-LIDU, GES circuit-mode services shall
is still under way and call progress tones from that network forward a "clcar forward" event (FITE 22) to the
may be audible to the on-aircraft party. If the called party interworking interface, forward to the link layer six "call
Annex 10 - Aeronautical Telecomntunicalions Volume III
progress - channel release" CM-LIDUs via the C
channel sub-band, and perform the GES incoming
release guard procedure defined in 4.8.6.1.2.2.6;
otherwise, GES circuit-mode services shall perform the
GES incornitlg C channel maintenance procedure
defined in 4.8.6.1.2.2.5; or
e) if an "answer" event (BITE 22) is received at the
interworking inlerface, GES circuit-mode services shall
stop forwarding "call progress - test" CM-LIDUs. It
shall then forward to he link layer a "call progress -
connect" CM-LIDU every tGlO seconds until a positive
"telephony acknowledge" CM-LIDU is received. If a
positive "telephony acknowledge" CM-LIDU is not
received within tGll seconds after the first "call
progress - connect" CM-LIDU was forwarded, GES
circuit-mode services shall forward a "clear forward"
event (FITE 22) to the interworking interface, forward to
the link layer six "call progress - channel release" CMLIDUs
via the C channel sub-band, and perform the
GES incoming release guard procedure defined in
4.8.6.1.2.2.6; otherwise, GES circuit-mode services
shall perform the GES incoming C channel maintenance
procedure defined in 4.8.6.1.2.2.5.
4.8.6.1.2.2.5 GES incoming C channel maintenance. GES
circuit-mode services shall then allow the end-to-end circuitmode
C O M ~ C ~t~o Oco~n tinue until any of the following occur:
a) if an "answer" event (BITE 22) is received at the
interworking interface, GES circuit-mode services shall
folward to the link layer a "call progress - connect"
CM-LIDU every tGlO seconds until a positive
"telephony acknowledge" CM-LIDU is received. If a
positive "telephony acknowledge" CM-LIDU is not
received within tGll seconds after the first "call
progress - connect" CM-EDU was foiwarded, GES
circuit-mode services shall fonvard a "clear forward"
event (FITE 22) to the interworking interface, forward to
the link layer six "call progress - channel release" CMLIDUs
via the C channel sub-band, and perform the
GES incoming release guard procedure defined in
4.8.6.1.2.2.6. Otherwise, GES circuit-mode services
shall allow the end-to-end circuit-mode connection to
continue; or
b) if a "clear back" event (BITE 25) is received at the
interworking interface, GES circuit-mode services shall
forward to he 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
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