Connecting Asterisk with Siemens Hicom


i have some problems with my asterisk.

We have 10 Siemens Optiset E advance plus telephones and a Siemens HiCom. We don`t use SIP/Voip.

How can I connect my asterisk to my Hicom and telephones (technology? etc.) ?

I red many posts about “how to connect to a SIP phone etc.”, but i havent found any posts about that problem here.

I hope, that somebody can help me.