In order for the operator and the terminal to identify one message from another, all messages
which enter message memory are assigned a message number. This applies to both send and
(1) In the ICT state:
Message numbering is done by the system using the EDIT Command
Operator enters the EDIT Command.
System checks the numbers in message memory.
System assigns the next highest sequence number to the message.
(2) System Initialization at power up:
The message memory is empty and message numbering is at zero.
When powered down, messages in message memory are erased and
message numbering is returned to zero.
Message memory is protected by Battery Backup if the POWER switch remains ON.
q Available message numbers range from 0001 to 9999.
message numbers will never occur because the system assigns sequential
numbers to received messages when they are received, and to composed messages
as they are being composed by the operator.