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5-40 Call control procedures
Figure 5-22
B-channel glare, BCHGLARE = YIELD
B-channel lockout
One end of the connection may not receive the expected message before
timer T308 or the DMS-250 switch lockout timer expires. The following
occurs in this case.
User-initiated call clearing
If the DMS-250 switch internal lockout timer expires before a REL COM
message is received, the network puts the trunk member in the lockout state.
If the REL COM message is received before timer T308 expires, the trunk
member is returned to idle from the lockout state.
If timer T308 expires before a REL COM message is received and after the
lockout timer has expired, a second REL message is sent and timer T308 is
restarted. If it expires a second time, the trunk member remains in the
lockout state until restart procedures are invoked on the PRI; otherwise, the
PRI trunk member is returned to idle from lockout, as shown in Figure 5-23.
297-2521-106 Standard 23.01 March 2001
Network selects a PRI trunk
on which to terminate
GLARE
BCHGLARE = YIELD, so network
backs down and lets CR = A
continue with normal call setup
Reselect/route advance
Network
SETUP (CR = A)
Normal call setup on
call reference A
User
. .
.
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