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carrier should be posted to a monitoring
function.
c) if a "call progress - channel release" CM-LIDU is
received, GES circuit-mode services shall await the
termination of the C channel from-aircraft carrier. If
the from-aircraft carrier is not present, terminate all
activities for the call; otherwise, if the C channel fromaircraft
carrier terminates within tG14 seconds after
receipt of the "call progress - channel releasey' CMLIDU,
GES circuit-mode services shall terminate all
activities for the call. If the C channel from-aircraft
Part l Annex 10 - Aeronaulical Telecornrrrunicatiuns
carrier does not terminate within the same tG14 second
period, GES circuit-mode services shall terminate all
activities for the call at the end of the period.
Note.- The status of an untenninated fmmaircraft
carrier should be posted to a monitoring
function.
4.8.7 ATS-specific terrestrial
network standards
Note.- Guidance material on aeronautical speech circuit
switching and signalling is contained in ICAO Circular 183 -
ATS Speech Circuits - Guidance Material on Switched
Network Planning and in Attachment A to Part I.
4.8.7.1 Closed user group. The AMS(R)S voice service
inclusive of interconnecting aircraft and terrestrial networks
shall be considered a closed user group to the extent that it is
a non-public safety service to be accessible only by ATS and
AOC users and used strictly for the conveyance of safety
information.
Note.- The dejinition of a closed user group implies that
a private numbering plan is also in effect. A telephony
numbering plan for the safety service need not conform to that
qfthe international public switched telephone network (PSTN)
as defzned in CCITT Recommendation E.163.
4.8.7.2 Safety terrestrial private networks. The 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
switching 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 paw without adversely
impacting any existing commu~iications by the grou~td
party;
b) automatic call-back in those instances where a call is
blocked by an engaged condition at a ground party;
c) the capability of alternate muting, when necessary and
feasible;
d) ident$cation of originator of incoming air-originated
calls, when feasible; and
e) call forwarding, when necessary and feasible.
Note.- Call forwarding ensures that calls to operating
posirions which are temporarily not manned will be rerouted
automatically to an appropriate operaring position.
4.8.7.2.2 The characteristics of the ringing tone, the busy
tone and the congestion tone used by the tmest.da1 n t t w ~ k
shall conform to III'U CCITT Recommendation E.180.
Note.- Details of ITU CCITT Recommendation E.180 are
contained in CCITT Blue Book, Volume II - 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. Recommendation.- &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 gmundoriginated
retunz call to the original aircraft. A AGES should
not be required to provide specijic functions that allow a
blocked call attempt to be held in a GES-managed internal
queue for Iater 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 AIRCRAFN~U MBERING
4.8.8.2.1 Spec<fic 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 1D of the aircraft
expressed as eight octal digits to which is appended the twodigit
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