XX is the name of a specific city or county. I searched, too. There are no specific rules.
This is the phone. You can call for details.
Call this number 4 1509 19 first.
Address: No.0/78, Ankang Road, Kunming.
Postal code: 650032
Tax policy consultation: 4 1509 19
Telephone number for reporting illegal cases: 4 100524
Service complaints: 4 15 1283
Reservation service hotline: 4 150524
Tax Assistance Hotline: 4 196074 (Administration Section)
4 1509 19 (Tax Administration Section)
4 150920 (Statistics and Systems Department)