btp voip raspberry pi

Hi All, I tried searching for this but couldn’t find any information. I want to try and connect my old bpt intercom to Linksys pap2t https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/csbpvga/pap2t/administration/guide/pap2t_user.pdf man’s maybe a raspberry pi to be able to buzz people...