hello all,

i want to handle the string that appear when i call a number.
in general when i press dial button first contactlist
is checked and if the number found it's string
appear on the screen(instead of number) .for example:
i enter the following number:
123
and press dial button.
so in the normal situation if 123 is exist in the
contact list(with the name abc),the following string appear:
calling abc
and if the number is not exist in the list following
string appears:
calling 123
i want to handle this string and display my_own_string
(whether is exist or not exist in the list ).

can anybody help me?
thanks in advance.