AIPHONE GF-1MD Compatibility

Hello

I wanna buy the Opener but want to confirm compatibility first. My system is quite old ~2005.

It has audio/video (b&w) and its the type which i need to pick up the headset after it rings and then push the Open button. the open button alone does nothing. if you pick up the headset and put back without pushing the open button… the person downstairs needs to ring again.

its a 2-wire bus system according to the manual:
http://pdfstream.manualsonline.com/e/ef0e63cb-f00c-49bc-8211-d9e7cc3cab2a.pdf

2 2-pair cables from the wall go into R1 and R2 / B1 and B2