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routine aspects of voice call management for the aircrew. For
instance, ground number directories and selection menus can
be provided by h s e systems so that the need for an aircrew
to enter discrete telephone numbers on a controYdisplay device
can be minimized. These systems could also correlate with
directory information the associated data link end-system
address information or the aircraft's position in order to
recommend an appropriate graund address for use in an ATC
call. However, it should be noted that the crew must be able to
select or otherwise imply the appropriate priority of a call
attempt prior to origination.
8.3.5 Air-originated cull informotion. When the GES
forwards an air-originated call to the terrestsial network, the
call indication wiIl include, in addition to the desired ground
address, the call's priority, and the AES-ID and calling
teminal-ID associated with the call. (Annex 10. Volume III,
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 pre-emptlon adon within that network and ta notify
the ground 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 faciIitate
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 iafo~mation canceming the
aircraft.
8.3.6 Cormluted muting. Call routing functions within a
facility should be able to determine the proper internal
destinatian to which a call should be mted based on the
facility's current data pertaining to the aircraft. This quires
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 usefi
Consideration should be given to the establishment of a
universal default agent code in the AMS(R)S ground
numbering plan (e.g, 'W) 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. The ground
user should have several options available for those instances
when an &-originated call arrives while they are conducting a
preexisting 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 nser and the terrestrial voice network. In addition, the
grorrnd user should receive an immediate presentation of the
call information listed in 8.3.5 for all arriving calls so as to
facilitate a proper call handling decision. Examples of two
possible operational mod@ are as follows:
a) Burgeiin. All arriving calls for an individual destination
are automatically auswered by an automation fumtion
on behalf of the ground user; .and are. placed in a rnultiway
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 VMF radio. Barging in
Attachment A to Piwl 1 Annex 10 - Asmnauticd Telecornmunicalions
to an active conversation, however, would quire that
the caller tie up a C channel resource while waiting for
the previous conversation to end.
b) Serial access with priority override. 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 conferenced 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 tenninating an existing lower priority call.
8.3.8 Airnm.fr microphone push-to-talk opemtion. The
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