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Figure 14-1
NCAUUI Invocation Acknowledgement
Originating PBX
SETUP (NCAUUI Request)
After the Q.931 NCAUUI SETUP message is sent to the terminating user,
the DMS-250 switch moves into the Call Received network state (N7) and
timer T310 (10 seconds) starts. This timer stops upon receiving the Q.931
CONNect message. If the T310 timer expires before receiving the Q.931
CONNect message, the DMS-250 switch sends a Q.931 RELease COMPlete
message to the terminating user and a Q.931 RELease with a cause value of
18 "No User Responding" to the originating user.
The DMS-250 switch does not send a Q.931 CALL PROCeeding message to
the originating PBX after receiving the NCAUUI SETUP message from the
originating PBX.
If after sending the Q.931 NCAUUI SETUP message to the called user, the
DMS-250 switch receives a CAUUI3 request within a FACility message
from either the originating or the terminating user prior to receiving a Q.931
RELease, or RELease COMPlete message, the DMS-250 switch does not
report the FACility message to the far-end user. The DMS-250 switch sends
a FACility REJect message to the sender of the FACility message with a
cause value of 29 "Facility Rejected," location code of "Transit," and coding
standard of "CCITT." FACility messages received from the originating or
terminating user for any other purpose than a CAUUI request are ignored.
CONNect
CONNect ACKnowledge
User Information
User Information
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
DMS-250
SETUP (NCAUUI Request)
T310 Started
T310 Stopped
CONNect ACKnowledge
User Information
User Information
NCAUUI 14-3
Terminating PBX
CONNect
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