User's Manual Part 1

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Receiving an ALE Call
Various types of ALE call can be received as described below. When an ALE call to
your station commences the following is displayed on your transceiver:-
A station in the ALE net is attempting to establish a link to your
station:-
Your station is now linked, an audible alarm sounds:-
This is a normal call and conversation can now commence.
Or
An address has matched an incoming Wildcard address.
Wildcard addresses have special characters (question marks) in
them that do not require an exact match with the local address to
link E.g. “FIELD?” will link with any station that has a self address
starting with FIELD and ending in a single additional character (for
example, FIELD1 or FIELDA). A station that linked using a
Wildcard call may not be the only station in the link.
Stations respond to a Wildcard call in random slots.