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3.13.3 Channel Status
Comprehensive information about the call progress is available through the Channel Status
window. This window indicates the various stages each B-channel goes through whilst
establishing a connection.
Status -
BRI
Comments
Idle
Calling
Connected
Sync
Active
Releasing
Released
the channel is idle
when calling — the network has acknowledged the call
when connection is established
when the channels are synchronized
when all available channels are connected
waiting for the network to confirm a release of the call
when disconnected - the network has acknowledged the disconnection
Cause codes
The most common cause codes (for ISDN) are:
1
2
16
17
18
21
28
29
31
34
41
58
65
69
81
88
100
102
127
255
Unallocated (unassigned) number
No route to specified transit network (WAN)
Normal clearing
User busy
No user responding
Call rejected
Invalid number format (incomplete number)
Facility rejected
Normal, unspecified
No circuit/channel available
Temporary failure
Bearer capability not presently available
Bearer service not implemented
Requested facility not implemented
Invalid call reference value
Incompatible destination
Invalid information element contents
Recovery on timer expiry
Internetworking, unspecified
TANDBERG specific. undefined cause code
PRI Red Alarm
Red alarm or Loss of signal (LOS) means that there is no signal and thus no framing info
received (this has same effect as pulling out the PRI cable).