User can choose from up to 30 different messages. Of these 30 messages, 15 are fixed messages, and 15 are custom messages. Each message has a corresponding message number.

While a user selects a Posted Message, his or her telephone is said to be in selection display mode. Once the user posts a message, his or her telephone is said to be in message posting mode. The telephone screen of the user displays the message. The display of the selected message on the telephone is a visual reminder to the user. The display also indicates the availability of the user to people who might walk into the office.

Telephones that are in message posting mode use a special dial tone when the telephone goes off hook. This special dial tone provides audio feedback to the user. On telephones without a display, this special dial tone is the only indication that the telephone is in message posting mode.

The telephone of the user displays the selected message until:

• The user or someone else deactivates the posted message on the telephone of the user.

• The system resets. If the system resets, the telephone screen of the user no longer displays the posted message.