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d) if any of the following responses are received, AES
circuit-mode services shall do the following:
1) if either a "call progress - call attempt result" CMLIDU
or a "call progress - channel release" CMLIDU
are received, AES circuit-mode servic,es shall
forward a "clear back" event (BITE 25) or an
appropriate "call unsuccessful" event (BPTE 14, 15,
16, 17, or 20) to the interworking interface as
determined by the cause location, cause class, and
cause value parameters received in the CM-LIDU.
AES circuit-mode services shall then terminate all
activities for the call; or
2) if a "C channel assignment" CM-LIDU is received,
AES circuit-mode services shall request AES
management to allocate C channel resources and
activate a C channel unit on the assigned frequency 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 is inferred from the Q number used in the
initial circuit-mode call signalling at the link layer:
AES circuit-mode services shall then forward to the
link layer a "call information - service address"
CM-LIDU every tA29 seconds indefinitely and
interconnect the C channel audio interface with that
of the calling terminal.
Note.- The call information conveyed by the
"call information - service address" CM-LIDU is
redundant with rhnr conveyed by the "access
request" CM-LIDU, when the access request
procedure used is not the "general access request"
procedure- In this case, this informarion is used to
maintain compatibility with the circuit conrinuiiy rest
procedure in use by those GESs which are providing
AMSS services to non-AMS(R)S users; and it will nor
be submitted to digit analysis by a GES.
4.8.6.1.1.1.2 If no response is received from GES circnitmode
services within tA28 seconds after C channel unit
activation, AES circuit-mode services shall forward to the link
layer six "call progress - channel release" CM-LIDUs via the
C channel sub-band, retnrn a "call unsuccessful - line out of
service" event (BITE 17) to the interworking interface, and
terminate all activities for the call; otherwise, AES circuitmode
services shall do the following:
a) if one or more "call progress - test" CM-LIDUs are
received, AES circuit-mode services shall ignore them;
or
b) if one or more "call progress - channel release" CMLIDUs
are received, or if a "clear forward" event (FITE
22) is received at the interworking interface, then AES
circuit-mode services shall forward to the link layer six
"call progress - channel release" CM-LIDUs via the C
channel sub-band, return an appropriate telephony event
(BITE 14, 15, 16, 17, 20, or 25) to the interworking
interface, and terminate all activities for the call: or
c) if a "call progress - connect" CM-LIDU is received, or
if the CM-LIDU arrives preceded by either a "call
progress - test" CM-LIDU or a "call progress - call
attempt result" CM-LIDU which was previously
received within tA28 seconds after C channel unit
activation, AES circuit-mode services shall do the
following:
1) ensure that the repetitive transmission of the "call
information - service address" CM-LIDU has
ceased; and
2) forward an "answer" event (BITE 22) to the
interworking interface and forward to the link layer a
positive "telephony acknowledge" CM-LIDU via the
C channel sub-band. If any additional "call progress
- connect" CM-LIDUs are received subsequent to
the initial "call progress - connect" CM-LIDU,
AES circuit-mode services shall respond to each by
forwarding to the link layer a positive "telephony
acknowledge" CM-LIDU to GES circuit-mode
services; or
Note.- At this point the end-to-end call is
established.
d) if a "call progress - call attempt result" CM-LIDU
(encoded to indicate an "address complete" event) is
received, or if it arrives preceded by a "call progress -
test" CM-LIDU which was previously received within
tA28 seconds after C channel unit activation, AES
circuit-mode services shall do the following:
1) ensure that the repetitive transmission of the "call
information - service address" CM-LIDU has
ceased; and
2) forward an "address completc" event (BlTE 5) to the
interworking interface and forward to the link layer a
positive "telephony acknowledge" CM-LIDU via the
　
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