MAUUI 19-11
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Figure 19-10
PRI-PRI Call Clearing before ACM when Treatment Applied
Q.931 Call Proceeding
Q.931 Setup (UUI)
Q.931 DISConnect
Q.931 RELease
Q.931 RELease COMPlete
Q.931 Progress (UUI)
Applied tones or announcements
ISUP IAM (UUI)
ISUP REL (UUI)
ISUP RLC
MWC DMS-250
PRI-ISUP Call Clearing After ACM/Before ANM
There are two scenarios concerning UUI delivery in a call clearing message
before the terminator sends an indication of answer. In the first scenario, the
originating PRI agent includes UUI in the Q.931 Setup message to invoke
the MAUUI service. AN ISUP IAM message with UUI is sent to the
terminating ISUP agent. The terminating ISUP agent responds to this
message with a ISUP ACM message and a Q.931 Alerting message is
transported to the originating PRI agent (UUI is included if received in the
ISUP ACM message). The terminating ISUP agent then sends an ISUP REL
message with UUI. If treatment is not applied at this switch, the UUI is
transported to the originating PRI agent in the corresponding Q.931
DISConnect message.
The following diagram shows the “PRI to ISUP call clearing before ANM
when treatment is not applied” scenario.
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