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Table 19-1
UUI Functionality
If
The call clearing message with UUI received
before ACM/alerting delivered.
The call clearing message with UUI received
after ACM/alerting delivered.
The call clearing message with UUI received
after ANM/connect delivered.
The following sections concentrate on three different call
originator-terminator combinations and the resulting basic scenarios that can
arise with the new functionality in place. The combinations are as follows:
PRI–PRI scenarios
PRI-PRI Call Clearing Received before Alerting
There are two scenarios concerning User-to-User Interface (UUI) delivery in
a call clearing message before the terminator sends an indication of alerting
before answer. In the first scenario, the originating PRI agent includes UUI
in the Q.931 Setup message to invoke the MAUUI service. The Q.931 Setup
message with UUI is sent to the terminating PRI agent. The terminating PRI
agent responds to this message with a Q.931 DISConnect message with
PRI originator to PRI terminator scenarios
ISUP originator to ISUP terminator scenarios
PRI originator to ISUP terminator and ISUP originator to PRI terminator
scenarios
Network Scenarios
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Then
The UUI in the call clearing message is
transported to the originating agent in the
backwards ISUP ACM or Q.931
Progress messages. The messages are
used to establish the voice path for the
tones or announcements.
The UUI is transported in the backwards
ISUP CPG or Q.931 Progress message
before the tones or announcements are
applied.
Current functionality does not deliver
UUI on calls that result in tones or
announcements after answer indication is
received. This functionality is not being
changed by this feature but is included
for completeness.
—end—
MAUUI 19-3
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