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4.8.7.2 Safety terrestrial private n~tw0I-kT~h. e GES shall
interwork in tandem with private ground networks that may be
implemented by ATS administrations and aircraft operators.
These networks shall provide connectivity between the GES
facilities and the relevant ATS or aircraft operator facilities and
shall interwork with the GES circuit-mode procedures defined
herein.
4.8.7.2.1 The application of aeronautical speech circuit
swilching and signalling interfaces between the GES and an
administration or aircraft operator shall be made on the basis
of individual agreements.
4.8.7.2.1.1 Recommendation.- Terrestrial networks
should provide:
a) priority access to the ground party without adversely
impacting any aisting communications by the ground
party;
b) a~ltomatic call-back in those instances where a call is
blocked by an engaged condition at a ground party;
cj the capability of alternate routing, when necessary and
feasible;
d) ident@cution of originator oj incoming air-originated
calls, when feasible; and
e) call forwarding, when necessary and feasible.
Note.- Call forwarding ensures that calls to operating
positions which are temporarily not manned will be rerouted
automatically to an appropriate operating position.
4.8.7.2.2 The characteristics of the ringing tone, the busy
tone and the congestion tone used by the terrestrial network
shall conform to ITU CCITT Recommendation E. 180.
Note.- Details of lTU C C I n Recommendation E-180 am
contained in CCZTT Blue Book, Volume ZI - Fascicle 11-2.
4.8.7.3 Registration of air-originated attempts to a busy
ground party. All call attempts offered to a terrestrial network
or a ground destination shall be afforded the priority and
pre-emption services defined in 4.8.3.2.
4.8.7.3.1 Recornmendation.- If an air-originated call
attempt is blocked due to an engaged condition at the ground
party, a record of the call attempt should be maintained by the
ground user or terrestrial network for a subsequent gtvundoriginated
return call to the original aircmfr. A AES should
not be required to provide specijic functions that allow a
blacked call attempt to be held in n GES-managed internal
queue for later service.
4.8.8 Telephony numbering plan
4.8.8.1 General. A universal telephony numbering plan
for AMS(R)S circuit-mode services shall be established so as
to facilitate universal interoperability with terrestrial networks.
4.8.8.2 AJRCRAFNTU MBERING
4.8.8.2.1 Specific requirements. A fixed address length of
10 address digits shall be allotted to the aircraft numbering
plan. All assigned addresses shall be of the same length.
4.8.8.2.2 Address analysis. Numbering of individual
aircraft destinations shall consist of the AES ID of the aircraft
expressed as eight octal digits to which is appended the twodigit
decimal ID of the calling or called terminal on the aircraft
numbered from 00 to 99 decimal. The first 10 terminal
addresses (00-09) shall be reserved for ATS application.
4.8.8.2.2.1 M S circuit-mode services shall maintain a
private, 100 entry terminal ID address space specific to all
AMS(R)S safety terminals on an aircraft. Use of this address
59 2/11/00
No. 75
Annex 10 - Aeronautical Telecommunications Volume ZII
space, as opposed to t h ~pa rallel address space for non-safety
services, shall be inferred by AES circuit-mode services by the
associated priority of the call attempt.
4.8.8.2.2.2 Recommendation.- Subsequent mutual
agreement by aircrafi manufacturers and ATS administrations
should provide for the assignment of aircraft terminal ID "00"
as the default destination for all ground-originated safety
wice calls to an ai~raj?. Flight deck audio management
systems should associate any incoming call directed to this
teminnl ID with an appropriat~ available audio channel on
thePight deck (e.g. "SATCOM 1 " or "SATCOM 2" an a$ight
deck audio panel). Terminal IDS "05" to "09" should be
reserved for the future application of facsimile devices or other
types of digital termi~ls.
4.8.8.3 TERRESTRIAL NUMBERING
4.8.8.3.1 Ground destination address. When there exists a
private network specifically intended to supporc safety circuit
mode services, all terrestrial addresses shall be 10 digits in
length. In the other cases, the terrestrial addresses for safety
calls are of variable length and shall be in accordance with the
numbering plan of the network to which the call is directed.
4.8.8.3.1.1 Address analysis. When there exists a private
network specifically intended to support safety circuit mode
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