I've noticed that some of the TMA frequencies in Switzerland does not match with the correct ATC-unit. For example, around Zurich, SD mentions "Zurich Information", but this is only the FIS-frequency and they can't give clearances by themselves. For TMA crossings "Zurich Terminal" is the correct ATC-unit to contact in TMA-airspace around Zurich for VFR-traffic in class C. For crossings within the non-TMA and non-CTR airspaces (class C and D), "Zurich Delta" is the correct ATC-unit. They give for example clearances to cross corridors and in general class C airspace above FL100/FL130.

In Germany, the non-CTR airspaces in class D and C doesn't have published frequencies for VFR-charts at all, but they are mentioned within the IFR-arrival/departure charts as Radar frequency. For example around Suttgart, this would be "Langen Radar" on 125,050 or 119,200 and around Cologne/Bonn, this would be also "Langen Radar", but now on 135,350. The problem here is the German ATC-company "DFS", which want to force VFR-pilots to contact FIS first prior to cross airspace class C or D.

We generally match what the official AIP states as the primary contact frequency for a piece of airspace. Most airspaces have this information specified. Are you saying that in Switzerland we have got this wrong, or that the AIP itself is suggesting an inappropriate frequency?

In Germany we are aware that a contact frequency is not mentioned for the local class C and D around airfields, and that is because they prefer you to contact the local FIS, which of course is present on screen. Our discussions with DFS on this matter have not resulted in them conceding to list frequencies for those airspaces so what we're currently doing does seem appropriate.