Help by connecting OpenBSC with Asterisk

Hi, List!

I have now to connect OpenBSC with Asterisk, in order to use a VoIP-phone to call mobiles (and viceversa). I found this HowTo: http://openbsc.osmocom.org/trac/wiki/OpenBSC_LCR

Since I don't know Asterisk I'm not sure if it is what I really need...

In the HowTo 2 ISDN-Cards are used. Need I really these? I'm using a nanoBTS (accessed over Ethernet), so I think I don't need the Cologne Chips E1 PCI card. Is it right?

Then, at least as first step, I don't want to connect my Asterisk with the rest of the world. I really want to create my own test-network with a VoiIP-phone and a couple of mobiles. Do I really need a ISDN-card?

And last, but not least, (as I said, I don't know Asterisk!!), how can I decide, that a number I choose from mobile or VoiIP-phone is a mobile or a VoiIP-phone?

Maybe there is a running configuration of Asterisk I can use as example?

Thanks a lot for your help!