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to select or-otherwise imply the appropriate priority of a call
anempt prior to origination.
8.3.5 Air-originated call infownation. When the GES
forwards an air-originated call to the terrestrial network, the
call indication will include, in addition to the desired ground
address, the call's priority, and the AES-ID and calling
terminal-ID associated with the call. (Annex 10, Volume itI,
Part I, Appendix 5 to Chapter 4, Figure A5-28 refers). The call
priority can be used by the terrestrial network to facilitate a
potential preemption action within that network and to notify
the gromd destination of the call's priority in cases where the
ground user might be servicing other calls. The AES and terminal
ID information is provided so as to facilitate correlated
routing (8.3.6) of the call (by an ACF or other facility) to the
proper destination within that facility as determined by the
facility's information concerning the aircraft.
8.3.6 Correlated routing. Call routing functions within
a facility should be able to determine the proper internal
destination to which a call should be routed based on the
facility's current data pertaining to the aircraft. This requires
that the facility correlate the originating aircraft's AES-ID (see
8.3.5) with information that it may have concerning the aircraft
and then route the call to the relevant ground user. Consideration
should be given to the establishment of a universal
default agent code in the AMS(R)S ground numbering plan
(e.g. "000") which would be known to all facilities to be an
implied request by the aircrew to provide the correlation
function. The remaining 999 code values in the agent code
field would remain available for discrete ground user addresses
within a facility.
8.3.7 Facility incoming call management. Tbe ground
user should have several options available for those instances
when an air-originated call arrives while they are conducting
a pre-existing call with another aircraft. A ground user should
be able to combine any reasonable number of satellite voice
calls in a conference so that the communications service can
be managed in a manner similar to a VHF radio channel if the
ground user so chooses. This can be implemented with a
conventional telephony conference bridge situated between the
ground user and the terrestrial voice network. In addition, the
ground user should receive an immediate presentation of the
call information listed in 8.3.5 for all arriving calls so as to
facilitate a pmper call handling &ision. Examples of two
possible operational modes are as follows:
a) Barge-in. All arriving calls for an individual destination
are automatically answered by an automation
function on behalf of the ground user; and are placed
in a multi-way conference consisting of the ground
user and any existing calls. This is intrinsically the
simplest mode of operation in that it allows all users
to immediately contend for the ground user's attention
by listening for any active conversation just as in VHF
radio. Barging in to an active conversation, however,
would require that the caller tie up a C channel
resowe while waiting for the previous conversation to
end.
b) Serial access with priority averride. An arriving call
for an individual destination is automatically answered
by an automation function on behalf of the ground
user. Any additional calls arriving at a priority equal
to or lower than an existing call receive a "busy"
indication and are cleared automatically. Any additional
calls arriving at a priority higher than an
existing call are answered automatically and wnferenced
with any call(s) that the ground user is currently
conducting. This allows only higher priority calls to
"barge-in" on existing calls. It also allows a calling
aircrew (at the higher priority) to gain the ground
user's attention verbally without needlessly terminating
an existing lower priority call.
8.3.8 Aircraft microphone push-to-talk operation. The
AMSS voice channel provides a bi-directional audio path
which is inherently full-duplex. However, it is strongly recommended
that conventional (i.e. VHF-like) half-duplex push-totalk
(PTT) operation be 'maintained in all aircraft installations
- bur only to the extent that the flight crew must actuate a
P'TT key in order to be heard by the ground user. In other
Annex 10 - Aerohautical Telecommunications V o h e 111
words, to-aircraft audio should always be audible in
headphones without muting when the FTT key is actuated.
(Designers should still pay due attention to cockpit speaker
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