Procedures under the Federal Recognition Law
With the enactment of the Federal Recognition Law of 2012 (Anerkennungsgesetz), the application field of the EU directive concerning professional recognition from 2005 got a lot wider, allowing non-EU nationals from third countries to be able to get their qualifications checked as well. Professional recognition can be sought regardless of nationality and place of residence. So, you can apply for it from a third country and do not need to be in Germany. Requirements are that you have the foreign qualification and documents that prove that. The authorities will then examine whether the qualification is comparable to a German qualification. Work experience can also be considered. This process can take up to three months. The result is either that the qualification is equal to a German qualification or that there are essential differences. These differences can usually be settled by participating in lectures, further education classes, or obtaining additional qualifications.
It should be noted that the procedure of professional recognition is not a visa. It is, however, presumed when you are planning to immigrate to Germany under the Skilled Immigration Act.