If there is no profile picture for contacts in the ProCall monitor or in the favorites, a contact abbreviation is displayed instead:
Normally, the first character from the first name and surname fields is combined if they are available.
If the first name and surname do not exist, the first character of the display name is used if there is a display name.
If the display name is not set, the first character of the surname is used if it is set.
Otherwise, the first character of the first name is used.
Line contacts have no abbreviations.