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event (FITE 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.
4.8.6.1.2.2.5 GES incoming C channel maintenance.
GES circuit-mode services shall then allow the end-to-end
circuit-mode connection to continue until any of the following
occur:
a) if an "answer" event (BITE 22) is received at the
interworking interface, GES circuit-mode services shall
forward 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-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"
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 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 the link layer six "call progress - channel
release" CM-LDUs 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
cj if the C channel from-aircraft carrier terminates for
more than tC13 seconds, GES circuit-mode services
shall forward a "clear forward" event (HTE 22) to the
interworking interface. GES circuit-mode services shall
then forward to the link layer six "call progress -
channel release" CM-LIDUs via the C channel
sub-band and then perform the GES incoming release
guard procedure defined in 4.8.2.1.2.2.6; or
d) if a "call progress - channel release" CM-LIDU is
received, GES circuit-mode services shall forward a
"clear forward" event (FITE 22) to the interworking
interface. (If additional "call progress - channel
release" CM-LIDUs are received, GES circuit-mode
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 does
not terminate within tG14 seconds after the receipt of
the "call progress - channel release" CM-LIDU, GES
circuit-mode services shall terminate all activities for
the call. If the C channel from-aircraft carrier terminates
within the same tG14 second period, GES
circuit-mode services shall terminate all activities for
the call at the end of the period.
Note.- The status of an unterminated fromaircraft
carrier should be posted to a monitoring
function.
4.8.6.1.2.2.6 GES incoming release guard. When
releasing a C channel which is in use for an air-origination,
GES circuit-mode services shall do the following when
required elsewhere in 4.8:
a) if the C channel from-aircraft carrier terminates within
tG12 seconds after the last of the six "call progress -
channel release" CM-LIDUs was forwarded, GES
circuit-mode services shall terminate all activities for
the call; or
b) if the C channel from-aircraft carrier does not
terminate within tG12 seconds after the last of the six
"call progress - channel release" CM-LIDUs was
forwarded, GES circuit-mode services shall forward to
the link layer twelve "call progress - channel release"
CM-LLDUs via the C channel sub-band followed by
one "call progress - channel release" CM-LDU via
the P channel. 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 after the transmission of the "call
progress - channel release" CM-LIDU sent via the P
channel, GES circuit-mode services shall terminate all
activities for the call. If the C channel from-aircraft
carrier does not terminate within the same tG 14 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 fromaircraft
　
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