GXE5028 and Skype SIP incoming?

Sorry for the fairly newbie question but I have configured an GXE5028 to use Skype SIP. Outgoing works great along with the caller ID but I could not figure how I could set up incoming calls going either to an extension or an answering machine/IVR. I tried to check the manuals and forums but there doesn't seem to be a definitive answer to this question. Any tips or proper config would be appreciated. Thanks all.|||here is the product documentation page http://www.grandstream.com/support/gxe_s鈥?/a>





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