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AES circuit-mode services shall forward to the
link layer nA23 "abbreviated access request -
, telephone" CM-LLDUs.
4.8.6.1.1.1.1 AES circuit-mode services shall do the
following while awaiting a response from GES circuit-mode
services:
a) if a response is not received from GES circuit-mode
services within tA50 seconds after the uansmission of
the latest "abbreviated access request - telephony"
CM-LIDU, the AES shall command the selection of an
R channeI frequency and then shall transmit the
original quantity of CM-LIDUs; provided that the total
number of retransmissions of the CM-LIDU series
does not exceed four. If, tA50 seconds after the fourth
retransmission of the CM-LIDU series, no response
has been received, AES circuit-mode services shall
return a "call unsuccessful - line out of service"
event (BITE 17) to the interworking interface and
terminate all activities for the call: or
b) if a "clear forward" event (FITE 22) is received at the
interworking interface, AES circuit-mode services shall
forward to the link layer a "call progress - channel
release" CM-LIDU via the R channel and terminate all
activities for the call: or
c) if the call attempt is to be pre-empted by a higher
priority call, U Sci rcuit-mode services shall forward
a "clear back" event (BITE 25) to the interworking
interface, forward to the link layer a "call progress -
channel release" CM-LIDW via the R channel, and
then terminate all activities for the call; or
d) if any of the following responses are received, AES
circuit-mode services shall do the following:
1) if either a "call progress - call attempt result"
CM-LlDU or a "call progress - channel release"
CM-LIDU are received, AES circuit-mode services
shall forward a "clear back" event (BITE 25) or an
appropriate "call unsuccessful" event (BITE 14,
15, 16, 17, or 20) to the interworking interface as
determined by the cause location. cause class, and
cause value parameters received in the CM-LIDU.
AES circuit-mode services shall then terminate all
activities for the call; or
2) if a "C channel assignment" CM-LLDU is received,
AES circuit-mode services shall request AES
management to allocate C channel resources and
- activate a C channel unit on the assigned
frequency at the C channel Q number value as per
Table 4-43.
Nore.- This is to say that the Q number of the
C cltan,nel is inferred from the Q number used in
the initial circuit-mode call signalling at the link
la ye^
AES circuit-mode services shall then forward to
the link layer a "call information - service
address" CM-LIDU every tA29 seconds indefinitely
and interconnect the C channel audio
interfiace with that of the calling terminal.
Note.- The call information conveyed by the
"cnll information - service address" CM-LIDU is
redundant with that conveyed by the "abbreviated
access requesr" CM-LJDU. This ihfonnatio~ is
used ro maintain compatibility with the circuit
co~ttinuit);t est procedure in use by those GESs
which are providi~g AMSS services to non-
AMS(R)S users; and it will not be submitted to
. digit analysis by a GES.
4.8.6.1.1.1.2 If no response is received from GES
circuit-mode services within tA28 seconds after C channel unit
activation, AES circuit-mode sewices shall forward to the link
layer six "call progress -channel release" CM-LIDUs via the
C channel sub-band, return a "call unsuccessful - line out of
service" event (BITE 17) to the interworking interface, and
terminate all activities for the call; otherwise, AES circuitmode
services shall do the following:
a) if one or more "call progress - test" CM-LIDUs are
received, AES circuit-mode services shall ignore them;
or
bi if one or more "call progress - channel release" CMLIDUs
are received, or if a "clear forward" event
Annex 10 - Aeronautical Telecommunicalions
(FITE 22) is received at the interworking interface,
then AES circuit-mode services shall fonvard to the
link layer six "call progress - channel release" CMLIDUs
via the C channel sub-band, return an appropriate
telephony event (BITE 14, 15, 16, 17, 20, or 25)
to the interworking interface, and terminate all
activities for the call; or
c) if a "call progress - connect" CM-LIDU is received,
or if the CM-LIDU arrives preceded by either a "call
progress - test" CM-LIDU or a "call progress - call
　
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