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15-14 NCAUUI
Figure 15-9
Transfer of User Information
Originating PBX
SETUP (NCAUUI Request)
CONNect
CONNect ACKnowledge
User Information
User Information
The UUI inside the Q.931 User Information messages is transported by the
network without any interpretation. Any errors contained within the
messages are resolved by the end users. If the length of the Q.931 User
Information exceeds the maximum allowable length (251 bytes), the
message is discarded. A Q.931 Status message is sent to the sender of the
User Information message with a cause value of 43 "Access Information
Discarded", location code of "Transit", and coding standard of "CCITT".
Note: The maximum allowable length of a UUI IE carried by a User
Information message is 251 bytes. This includes the information element
codepoint and length indicator. The actual payload is 249 bytes of user
information. If more data is included in the ISDN User Information
message, the actual payload is 248 bytes of user information.
SCCP Inactivity Timers
Two inactivity control timers, the Receive Inactivity control timer T(iarcv)
and the Send Inactivity control timer T(iasend), are required at each end of
the connection section.
297-2521-106 Standard 23.01 March 2001
Originating MCI DMS–250
CR
Connection Request
CC
Connection Confirm
DT1 #20
Data Transfer
DT1 #20
Data Transfer
Terminating MCI DMS–250
SETUP (NCAUUI Request)
CONNect ACKnowledge
User Information
User Information
Terminating PBX
CONNect
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