Newbie at asterisk.. which hardware?

Hi,

I have right now a LMDS 4x4 line and Siemens QBRI-NT device with 4x NT1 or TR1(spanish) devices non rdsi, all of them analogic rj11.

Connected to them, there are some fax machines, analogic phones and a DKDA swithboard( see the link)

http://images.google.es/imgres?imgurl=http://www.compraventacentralitas.es/wp-content/uploads/2009/01/dkda-millenium-9.jpg&imgrefurl=http://www.compraventacentralitas.es/centralitas-dkda-millenium/2009/centralita-dkda-9-instalacion-incluida-en-el-precio/&usg=__oOqTiMcOdGzXhRxZfpVAxsi15C8=&h=261&w=291&sz=15&hl=es&start=1&sig2=F9z_srMiig5dhotcpubg9w&um=1&itbs=1&tbnid=r1lSufdxu4GwEM:&tbnh=103&tbnw=115&prev=/images%3Fq%3Ddkda%2B9%26um%3D1%26hl%3Des%26safe%3Dactive%26sa%3DN%26tbs%3Disch:1&ei=IBa7S_6VJISZ_Qbj2fC_CA

I want to integrate all lines with asterisk how is possible and which hard do I need?

best regards and thanks