Conneting Asterisk to Alcatel OmniPCX


I need to connect an Asterisk server equipped with 4 FXO, with Alcatl OmniPCX Enterprise XL to make external calls.
The scheme as I see it is:

PC softphone (Xlite) -> Astersik —> ALCATEL —> PSTN

I can not do a SIP or H323 trunk between Asterisk and ALCATEL because of license, and the only option I have is to connect Asterisk to Alcatel “Analog” interface.

I do not know how to interconnect these two servers, what protocol to use, is that the FXO card is sufficient, what type of port should I use at the Gateway ALCATEL…?

Could you help me see clearer, please?

Thank you for your help.