ADTRAN ISU 512e Manual page 125

Appendix B. Status Buffer Messages
TANULL expired
Bonding timer TANULL expired; non BONDING equipment attempt-
ed to call into the ISU 512e 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.
61203086L1-1 ISU 512e User Manual B-13