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15-20 NCAUUI
If the terminating user clears an established NCA-TSC with a Q.931
RELease or DISConnect message, the terminating DMS-250 switch
formulates and sends a Q.931 RELease COMPlete message to the
terminating ISDN user and an SCCP RLSD message towards the originating
switch. Once the originating switch receives the SCCP RLSD message, it
sends an SCCP RLC message to the terminating switch and a Q.931
RELease to the originating ISDN user. Any cause value received by the
originating switch is forwarded in the SCCP RLSD message and is delivered
to the originating ISDN user in the corresponding Q.931 RELease message.
Network Clearing
The network initiated Non-call associated clearing procedure is to send a
Q.931 RELease message to both end users.
The office parameter, MAX_USER_INFO, defines the maximum number of
User Information (i.e. UUI Information Element) that can be transported for
the life of the call. The DMS-250 switch does not check the
MAX_USER_INFO for NCAUUI call setup messages (i.e. Q.931 SETUP
and Q.931 CONNECT). The MAX_USER_INFO is only checked by the
DMS-250 switch upon receiving Q.931 USER INFORMATION message
from the end user. If the number of User Information transported in both
directions exceeds MAX_USER_INFO, the DMS-250 switch sends Q.931
RELEASE message with a cause value of 29 "Facility Rejected" to both end
users. MAX_USER_INFO is default to 25. However, it can be up to 65,535
which is the maximum number of User Information that can be transported
for the life of a NCAUUI call.
When the originating switch clears an established NCA-TSC, the originating
DMS-250 switch sends a Q.931 RELease message to the originating ISDN
user and an SCCP RLSD message to the terminating switch. Once the
terminating switch receives an SCCP RLSD message, it sends an SCCP
RLC message to the originating switch and a Q.931 RELease message to the
terminating ISDN user.
When the terminating switch clears an established NCA-TSC, the
terminating DMS-250 switch sends a Q.931 RELease message to the
terminating ISDN user and an SCCP RLSD message to the originating
switch. Once the originating switch receives an SCCP RLSD message, it
sends an SCCP RLC message to the terminating switch and a Q.931
RELease message to the originating ISDN user.
Release Timers
Release Sent Timer
297-2521-106 Standard 23.01 March 2001
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