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19-16 MAUUI
PRI-ISUP-PRI Call Clearing Received Before Alerting
The following multiple switch scenario shows the message flow in the
instance that the terminator sends a call clearing message with UUI before
sending an alert indication and this message causes tones/announcements to
be applied at the terminating switch for the originating agent. The UUI from
the call clearing message will be sent to the originating switch in the ACM
message used to establish voice path. The originating switch, upon receiving
this ACM message, sends out a Q.931 Progress message with UUI to the
originator to establish voice path. (NOTE: The reason a Q.931 Progress
message is sent out instead of a Q.931 Alerting message is because the
interworking bit in the Backward Call Indicator of the ACM denotes that
interworking was encountered.)
Figure 19-17
PRI-ISUP-PRI Call Clearing Received before Alerting when Treatment Applied
Q.931 Setup (UUI)
Q.931 Call Proceeding
Q.931 Progress (UUI)
Applied tones or announcements
Q.931 DISConnect
Q.931 RELease
Q.931 RELease COMPlete
PRI-ISUP-PRI Call Clearing Received Before Connect
The following multiple switch scenario shows the message flow in the
instance that the terminator sends a call clearing message with UUI after
sending an alert indication but before sending an answer indication. This
message causes tones/announcements to be applied at the terminating switch
for the originating agent. The UUI from the call clearing message is sent to
the originating switch in a CPG message. The originating switch, upon
receiving this CPG message, sends out a Q.931 Progress message with UUI
to the originator.
297-2521-106 Standard 23.01 March 2001
MWC DMS-250
ISUP IAM (UUI)
ISUP ACM(UUI)
Applied tones or announcements
ISUP REL
ISUP RLC
MWC DMS-250
Q.931 Setup (UUI)
Q.931 Call Proceeding
Q.931 DISConnect (UUI)
Q.931 RELease
Q.931 RELease COMPlete
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