Welltech Dialogic SS7 Protocols ISUP - Manual (Page 105)

Dialogic ® SS7 Protocols ISUP Programmer's Manual Issue 15
Successful continuity check during call set up
After a continuity check has succeeded during normal call set up, timer T24
(waiting for sending COT on receipt of backward check tone) should be
stopped and the transceiver removed. The application initiates the continuity
request thus indicating success and the call should be allowed to proceed in
the normal manner.
Figure 21. Example of a Continuity Check Success Outgoing Call Set Up
Call in Speech State: Proceed as usual
ANM ANM
COT (success) COT (success)
ACM ACM
IAM IAM
ISUP
MODULE
USER
APPLICATION NETWORK
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