Setup Incomming Trunks

Can someone help me to setup to receive incoming phone calls from www.skypho.net (http://www.euteliavoip.com)?

Here is the manual they gave to me but I could not make it work at FreePBX. The outgoing calls work but incoming seams to not be answered from the Asterisk server.

http://www.euteliavoip.com/download/manuals/EUTELIAVOIP_Asterisk_PBX_Configuration_Manual_rev1-0_en.pdf

Thank you very much in advance.