When WTO message buffer use reaches 80% of the limit, the system issues the following message. The system also takes out of hold mode any consoles in hold mode with messages queued.

IEA405E WTO BUFFER SHORTAGE - 80% FULL    

If the problem continues and WTO buffer use reaches its limit, the system issues the following message:

IEA404A SEVERE WTO BUFFER SHORTAGE - 100% FULL