Unfortunately skype is not supported.
That is because there is no console client, nor skype library, nor sources available for linux.
Skype is only available for windows, mac, linux_x86 (X-windows client only) and pocket PC.
I've considered buying a pocket pc for about 400USD equiped with WiFi and GPS to use it as skype-phone and GPS navigation -> it could be a good solution until some skype sources are available for linux.
Alternatively you can make a SIP phone from this router - there was a package named asterix (or somethink like that)