Avaya T3 (IP) Comfort - Manual (Page 161)

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Look it up whenever in doubt
Messages on the display
Phone book entry To save a call list entry or redial number in your personal
phone book.
Subs. Subscriber: enter the call number of the desired subscriber
here.
Transfer call When you want to forward a caller.
Invalid Invalid: you have entered a call number - an unknown code,
for example - that the telephone cannot dial.
Dial pause For storing a dial pause, such as between area code and
call number.
Transfer For forwarding the call to another subscriber.
Recall You have forwarded a caller to an internal subscriber who
does not answer. The call is returned to you.