ADTRAN ISU 512 User Manual page 93

Appendix A. Status Buffer Messages
TANULL expired
Bonding timer TANULL expired; non BONDING equipment attempted to call
into the ISU 512 while optioned for BONDING.
TEMPORARY_FAILURE
The network has temporarily failed; try the call again.
TIMER_EXPIRY
Call control error.
TXADD01 expired
Bonding timer TXADD01 expired, probably making a long distance call to a
foreign country; adjust timer value to correct.
TXFA1 expired
Bonding timer TXFA1 expired; other vendor's BONDING equipment did not
operate properly.
TXFA2 expired
Bonding timer TXFA1 expired; other vendor's BONDING equipment did not
operate properly.
TXINIT expired
Bonding timer TXINIT expired; called non-BONDING equipment.
UNASSIGNED_NUMBER
The phone number dialed does not exist.
Unknown AT & cmd
User issued an unknown AT command.
UNSPECIFIED_CAUSE
Received a cause message from the network that is not understood.
USER_BUSY
The dialed number is busy.
WRONG_MESSAGE
The ISU 512 received a message that does not match the valid messages de-
fined for the switch.
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