Micro PC installation

I am thinking about trying to install Aterisk or AsteriskNow on a micro PC with the following spec:

VIA Eden E4 1ghz processor
512 RAM
either 40gb HDD or 4gb memory card

I will not be able to install internal PCI cards, so will be stuck with VOIP (PSTN via ATA may be possible), so, what do we think the capacity of this server would be?

voip-info.org/tiki-index.php … mensioning would help.

not seen this before - thanks for the pointer!