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"telephony acknowledge" CM-LIDU via thc C
chamlel sub-band, forward an "AMS(R)S call
origination" event (FITE 18) to the interworking
interface and await completion of the call to the
called terminal as per thc AES incoming aircraft
co~npletionp rocedure defined in 4.8.6.1.1.2.3.
4.8.6.1.1.2.3 AES incomirtg aircrnfl completion. Where
required elsewhere in 4.8, AES circuit-mode services shall do
the following in order to complete a call across the aircraft
network to the called terminal:
a) if one or more "call progress - test" CM-LIDUs are
received, AES circuit-mode services shall forward to the
link laycr a positive "telephony acknowledge"
CM-LDU via the C channel sub-band; or
b) if an "answer" event (BITE 22) is not received from the
interworking interface within tA42 seconds after
forwarding the "AMS(R)S call origination" event (FITE
181, AES circuit-mode services shall forward a "clear
forward" event (FITE 22) to the interworking interface,
forward to the link laycr six "call progress - channel
release" CM-LIDUs via the C channel sub-band and
tenninate all activities for the call; or
c) if a "call progress - channel release" CM-LIDU is
received within tA42 seconds after forwarding the
"AMS(R)S call ori.ginationV event (FITE 1 X), or if the C
Annex 10 - Aeronautical Telecommunications Volurne 111
channel i,s to be pre-empted for a higher priority call,
then AES circuit-mode services shall forward a "clear
forward" event (FITE 22) lo the interworking interface,
forward to the link layer six "call progress - channel
release" CM-LlDUs via the C channel sub-band and
terminate all activities for the call; or
d) if an "answer" event (BITE 22) is received from the
interworking interface wilhin tA42 seconds after
forwarding the "AMS(R)S call origination" event (HTE
18), AES circuit-mode services shall forward to the link
layer a "call progress - connect" CM-LDU and
perform the AES incoming C channel maintenance
procedure defined in 4.8.6.1.1 2.4.
4.8.6.1.1.2.4 AES incoming C channel maintenance.
Where required elsewhere in 4.8, AES circuit-mode services
shall allow the end-to-end connection to continue while doing
the following to maintain a C channel:
a) if, within tA26 seconds after transmission of the latest
"call progress - conncct" CM-LIDU, neither a positive
"'telephony acknowledge" CM-LIDU is received or a
"clear back went (BlTE 25) is received from the
interworking interface, AES circuit-mode services shall
again forward to the link layer the "call progress -
connect" CM-LIDU via the C channel sub-band; or
b) if, within tA30 seconds after transmission of the first
"call progress - connect" CM-LTDU, neither a positive
"telephony acknowledge" CM-LIDU is received or a
"clear back" event (BITE 25) is received from the
interworking interface, AES circuit-mode services shall
stop forwarding the "call progress - connect"
CM-LWU, 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 terminate all activities for
the call; or
c) if, within tA30 seconds after transmission of the first
"call progress - connect" CM-LIDU, a "call progress
- channel release" CM-LlDU is received, AES circuitmode
services shall stop forwarding the "call progress
- connect" CM-LIDU, forward a "clear forward" event
e) if one or more positive "telephony acknowledge"
CM-LIDUS are received, i-eS circuil-mode services
shall stop forwarding the "call progrcss - connect"
CM-LXDU and do the following while allowing the C
channel to function:
Note.- This is the location in the logic procedure at
which the end-to-end voice channel is ready for use and
the air and ground users can begin conversation.
1) if a "clear back" event (BITE 25) is received from the
interworking interface, AES circuit-mode services
shall forward to he link laycr six "call progress -
channel release" CM-LDUs via the C channel subband
and terminate all activities for the call; or
2) if a "call progress - channel release" CM-LIDU is
received, AES circuit-mode services shall forward a
"clear forward" event (FlTE 22) to the intcrworking
interface, forward to the link. layer six "call progress
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