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cvent (BITE 25) to the intenvorking interface and
stop forwarding "call progress - test" CM-LIDUs-
GES circuit-mode services shall then wait LG23
seconds for the C channel from-aircraft carrier to
terminate. If the from-aircraft carrier is not present,
terminate all activities for the call; otherwise, if the
from-aircraft carrier terminates during the period,
GES circuit-mode services shall terminate all
activities for the call. I the from-aircraft carrier does
not terminate within this 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.
4) if a positive "telephony acknowledge" CM-LIDU is
received, GES circuit-mode sexvices shall stop
forwarding "call progress - test" CM-LIDUs. GES
circuit-mode services shall then forward an "address
complete" event (BITE 5) to the interworking
interface and perform the GES outgoing C channel.
nraintename procedure defined in 4.8.6.1.2.1.4; or
5) if a "call progress - connect" CM-CIDU is received,
GES circuit-mode services shall stop forwarding
I) if a "call progress - call attempt result" CM-LIDU "call progress - test" CM-LIDUs. GES circuitis
received, GES circuit-mode services shall stop mode services shall then forward an "address
complcte" event (BITE 5) and an "answer" evcnt
forwarding "call progress - test" CM-LIDUs to
AES circuit-mode services. GES circuit-mode (BITE 22) to the intenvorking interface, forward to
services shall then forward an appropriate "call the link layer a positive "telephony acknowledge"
CM-LIDU via the C channel sub-band, and perform
unsuccessful" event (BITE 12, 16 or 17) to the the GES outgoing C channcl maintenance procedure
interworking interface and await tG23 seconds for
the C channel from-aircraft carrier to terminate. If the defined in 4.8.6.1.2.1.4.
from-aircraft carrier is not present, terminate all
activities for the call; otherwise, if the [om-aircraft
carrier terminates by the end of the period, GES
circuit-mode services shall terminate all activities for
the call. If the from-aircraft carrier does not terminate
by the expiry of this period, GES circuit-mode
services shall terminate all activities for the call at
the end of the period; or
Note.- The tatus us of an nunterminated *fmmaircraft
carrier should be posted to a monitoring
jknction.
2) if a "clear forward" event (m 22) is received at the
interworking interface, GES circuit-mode services
shall forward to the link layer six "call progress -
channel release" CM-LIDUS via the C channel subband,
stop forwarding "call progress - test" CMLIDUs
and then perform the GES outgoing C
channel release guard procedure defined in
4.8.6.1.2.1.5; or
4.8.6.1.2.1.4 GES outgoing C channel maintenance.
Where required elsewhere in 4.8, GES circuit-mode services
shall enable the circuit path between the forward circuit of the
terrestrial network and the C channel unit, xnd then do the
following to maintain the C channel:
a) if a "call progress - connect" CM-LTDU is received,
CES circuit-mode services shall forward to the link
layer a positive "telephony acknowledge" CM-LIDU via
the C channel sub-band. If an identical CM-LIJIU was
not rcceived previously during the GES outgoing C
channel establishment procedure defined in
4.8.6.1.2.1.2, GES circuit-mode services shall also
fonvard an "answer" evcnt (BITE 22) to the
intenvorking interface; or
b) if a "clear fonvard" event is received at the intenvorking
interface, GES circuit-mode services shall forward to the
link layer six "call progress - channel release" CMLIDUs
via the C chatkel sub-band. GES circuit-mode
2flYOO
No. 75
Part 1 Annex 10 - Aeronautical Telecommunications
services shall then perform the GES outgoing C channel
release guard procedure defined in 4.8.6.1.2.1.5; or
c) if the C channel from-aircraft carrier drops for more
than tG19 seconds, GES circuit-mode services shall
forward a "clear back event (BITE 25) to the
interworking interface. GES circuit-mode serviccs shall
then forward to the link layer six "call progrcss -
channel release" CM-LIDUs via the C channel sub-band
and perform the GES outgoing C channel release guard
procedure defined in 4.8.6.1.2.1 -5; or
d) if the C channel is to bc pre-empted for a higher psiority
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