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stop forwarding the "call progress - connect"
CM-LIDU, forward a "clear forward event (FITE 22)
to the interworking interface, forward to Ihe 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-LIDU is received, AES
circuit-mode services shall stop forwarding the "call
progress - connect" CM-LIDU, forward a "clear
forward" event (FTTE 22) to the interworking interface,
forward to the link layer six "call progress -
channel release" CM-LIDUs via the C channel subband
and terminate all activities for the call; or
Annex 10 - Aeronautical Telecomrnurtications Volume 111
d) if the C channel is to be pre-empted for a higher
priority call, AES circuit-mode services shall forward
a "clear forward" event ( F I E 22) to the interworking
interface, forward to the link layer six "call progress
- channel release" CM-LIDUs via the C channel subband,
and terminate all activities for the call; or
e) if one or more positive "telephony acknow\edge"
CM-LIDUs are received, AES circuit-mode services
shall stop forwarding the "call progress - connect"
CM-LIDU 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 conversarion.
1) if a "clear back" event (BITE 25) is received from
the interworking interface, AES circuit-mode
services shall fonvard to the link layer six "call
progress - channeI release" CM-LIDUs via the C
channel --sub-band and terminate all activities for
the call; or
Tj if a "call progress - channel release" CM-LIDU
, is received, AES 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 terminate all activities
for the call; or
3) if the C channel is to be pre-empted for a higher
priority call, AES circuit-mode services shall
forward a "clear forward" event (FlTE 22) to 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
Note.-- The above logic transitions monitor for
call clearing via either a normal call clearing
action or an AES-initiated C channel pre-emption.
fl if the C channel sub-band link layer commands the
call be terminated, AES circuit-mode services shall
forward a "clear forward" event (FITE 22) to the
interworking interface and terminate all activities for
the call.
4.8.6.1.2 GES CIRCUIT-MODE LOGIC
,Vote.- The requirements for nzapping between interorki
king telephony events and CM-L;IDUs by the GES outgoing
and incolning procedures are defiled in Appendix 5 to
C'hnpter 3, Figures A5-19 ro A5-27 d B - 2 8 to A 5 4 , r~spe&.vely.
4.8.6.1.2.1 GES ourgoing circuit-mode procedure. This
procedure shall be defined by the following interrelated
procedures:
a) GES outgoing circuit-mode call initiation -
4.8.6.1.2.1.1;
b) GES outgoing C channel establishment -
4.8.6.1.2.1.2;
C) GES outgoing C channel continuity check -
4.8.6.1-2.1.3;
d) GES outgoing C channel maintenance - 4.8.6.1.2.1.4;
and
e) GES outgoing C channel release guard -
4.8.6.1.7.1.5.
4.8.6.1.2.1.1 GES outgoing circuit-mode call initiation.
Receipt of an "AMS(R)S call origination" event (FITE 18) at
the interworking interface shall cause GES circuit-mode
services to assign a unique application reference number to the
call. If the AES is not logged on. GES circuit-mode services
shall forward a "call unsuccessful - senderror indication"
event (BITE 20) to the interworking interface and terminate all
activities for the call; otherwise, GES circuit-mode services
shall request GES management to assign C channel resources
to the call at the C channel Q number value as per Table 4-43.
Note.- This is to say that the Q number of the C channel
shall be inferred from the Q nunzber used in the initial circuitmode
call signalling at the link layer:
GES circuit-mode services shall then do the following:
a) if a "clear forward" event (FITE 22) is received at the
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