001: Check number, redial (unallocated number) -> 3-Ton "Kein Anschluß unter dieser Nummer"
002: No route to network / prefix 0 dialed in error -> Fast Busy
003: No route to destination / prefix 1 dialed in error -> 3-Ton "Kein Anschluß unter dieser Nummer"
004: No prefix 1 / SIT -> Fast Busy
005: Misdialed trunk prefix (national use) -> Fast Busy
006: Channel unacceptable -> Fast Busy
007: Call awarded and being delivered on an established channel
008: Call is proceeding / preemption
009: Preemption, reserved -> Fast Busy
014: Excess digits received, call is proceeding
016: Far end disconnect (normal call clearing)
017: Busy, try again later (user busy) -> Besetzt
018: No far end response (no user responding) -> Fast Busy
019: No answer (no answer from user, user alerted) -> Besetzt
020: Subscriber absent -> Fast Busy
021: Call rejected -> 3-Ton "Dieser Anschluß ist vorübergehend nicht erreichbar"
022: Number changed -> Fast Busy
026: Nonselected user clearing -> Fast Busy
027: Destination out of order -> 3-Ton "Dieser Anschluß ist vorübergehend nicht erreichbar"
028: Incorrect number (invalid number format, address incomplete) / special intercept announcement
     -> Fast Busy
029: Facility rejected / special intercept announcement: undefined code -> 3-Ton "Dienst oder
     Dienstmerkmal nicht möglich"
030: Result of a status enquiry / special intercept announcement: number unassigned -> Fast Busy
031: Network disconnect (normal, unspecified) / special intercept announcement: call blocked because
     of group restrictions