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GES circuit-mode services is awaiting completion of the call
across the terrestrial network it shall enable the circuit path
between the C channel unit and the forward circuit of the ,
terrestrial network while simultaneously forwarding to the link
layer a "call progress - test" CM-LIDU every CGlO seconds
indefinitely. It shall also do the following:
Note.- At this point, circuit continuity is established
through the GES between the C channel and the terrestrial
network circuit. Call completion across the terrestrial network
is still under way and call progress tones from that network
may be audible to the on-aircraft party. I f the called party
answers the call attempt, this will be indicated by receipt from
the terrestrial nerwork of an "answer" event (BITE 22) at the
interworking inregace.
a) if the C channel from-aircraft carrier terminates for
more than tG 13 seconds, GES circuit-mode services
shall forward a "clear forward event (RTE 22) to the
interworking interface. Afier the FITE 22 event has
been forwarded, GES circuit-mode services shall stop
forwarding "call progress - test" CM-LIDUs. GES
circuit-mode services shall 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
b) if either a "release incoming side" event (BITE 29) or
a "call unsuccessful" event (BITE 12, 14, 15, 16, 17
or 20) were received from the interworking interface,
GES circuit-mode services shall stop forwarding "call
progress - test" CM-LIDUS. GES circuit-mode
services shall 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
c) if a "call progress - channel release" CM-LIDU is
received, GES ci,rcuit-mode services shall stop
forwarding "call progress - test" CM-LIDUs and
shall forward a "clear forward" event (FITE 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 camer
termindtes within tG14 seconds, GES circuit-mode
services shall terminate all activities for the call. If the
C channel from-aircraft carrier 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 unteminqted fromaircraft
carrier should be posted to a monitoring
function.
d) if an "address complete" event (BlTE 5) or "sending
finished" event (BITE 27) are received at the
interworking interface, GES circuit-mode services
shall. stop forwarding "call progress - test" CMLIDUs.
I1 shall then forward to the link layer a
"call progress - call attempt resultv CM-LIDU
every tGlO seconds until a positive "telephony
acknowledge" CM-LIDU is received. Lf a positive
"telephony acknowledge" CM-LIDU is not
received within tGl1 seconds of the transmission
of the first "call progress - call attempt result"
CM-LPDU, GES circuit-mode services shall forward
a "clear forward" event (HTE 22) to the
interworking interface, forward to the link layer six
"call 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 incoming 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 interface, GES circuit-mode services
shall stop forwarding "call progress - test" CMLIDUs.
It shall then fonvard to the link layer a
"call progress - connect" CM-LIDU every tG 10
seconds until a positive "telephony acknowledge"
CM-LLDU is received. If a positive "telephony
Aenex 10 - Aeronautical Telecornmunicutiorts Volume IIZ
acknowledge" CM-LIDU is not received within
tGl1 seconds after the first "call progress -
connect" CM-LIDU was forwarded, GES circuitmode
services shall forward a "clear forward"
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