Welltech Dialogic SS7 Protocols ISUP - Manual (Page 96)

Section 6 Interface to Application
Successful continuity test call
When a Continuity check request (CCR) message is received, a Circuit seized
indication (SZE) is sent to the application. The Circuit seized indication will
contain the Nature of connection indicators with the Continuity check
indicator set to “continuity check required on this circuit”, indicating that the
application should apply the check loop.
Once the continuity test has completed successfully, the call will be cleared
from the network and call release to the application proceeds as normal.
Figure 13. Example of a Successful Continuity Check Request Message Received
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RLC RLC
CCR CCR
REL REL
RLC
ISUP
MODULE
USER
APPLICATION NETWORK