Yes. There are factors that can prevent NTT from opening their service, even if your line is ADSL-compatible. These reasons include: fiber-optic network in the area, lack of ports on NTTs ADSL equipment, poor line quality, etc.

If you wish to check the line quality as a reference to use ADSL, you can check from the following NTT pages.
>> NTT EAST: Telephone Line Situation (Japanese)
>> NTT WEST: Line Information Disclosing System (Japanese)