Telefonnummer Nebenstelle kennzeichnen? (PhoneNumberValidator)

[MichaelFS]

You’re right @Vinzenz_Mai,

@Vinzenz_Mai

it should be

if number is German
and there is a hyphen followed by one to five digits [00..9]
    do not suggest a change to that hyphen, e.g. keep it
    do suggest changes to the rest of the number as it is done actually

just today I found an extension number having five digits, never seen that before …

For the functional numbers like *800 116117 we hade here the key phone:IT, which is typically used without leading zero, ref. here.