How do you dial a 6 digit phone number in Sydney, Australia with Skype?

I don’t think skype supports special numbers like that. You need a full land line number or a cell phone number. We have 4 digit free-phone service center numbers here in Norway and they don’t work on SKYPE.

thanks @cazzie that makes sense!

If it’s a number you intend to call more than once, it might be worth it to dlal them and ask them how to skype them – they must know how to do it, right? Perhaps they have a regular number as well…