Well my handset closely resembles BPT E/200P1 the button layout is a little different.
is this what you mean ?
https://www.bptuk.net/bpt-it-200-telephone-interface
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...