[Alfonso]

In Spain, in those areas where "seseo" is not usual, the letters "cc" are pronounced /kɵ/, that is, the beginning sound of cap followed by the beginning sound of thing, instead of /ks/, which is the most common pronunciation in the American countries and in some areas of Andalucía, Canarias and Extremadura (Spain).
The phenomena of pronouncing equally the consonant sound in "c+e", "c+i" / "z + vowel" and "s + vowel" is known by "seseo".
That makes equal the pronunciation of casa (house) and caza (hunting).
From the point of view of linguistics, this is said to be a neutralisation of the phonemes /s/ and /ɵ/.