change isdn4k-utils to optional

[Peter Robinson]

>> > I am not surprised that you have analogue dialup customers. I am very
>> > surprised that ISDN dialup still exists. ISDN BRI must have been a
>> > massive success in Germany compared to pretty much anywhere else.
>>
>> I'm surprised that people make so many assumptions about other countries.
>> And till I do not understand why it is so unbelievable that there are
>> still ISDN dialups.
>
> I think it's mainly "OMG HTF can you use teh intarwebs @ 128kbps"?  56k
> dialup is just unbelievably horrible for anything other than POP email
> these days, and ISDN is not much faster...  These days with ADSL pushing
> 30,000ft (about 9km) at more than two or three times ISDN speeds,
> there's not much of a point in ISDN.

You obviously haven't been to a lot of parts of Australia :-) And 9km
very much depends on the quality of the cooper as well.

Peter