Need to identify compatible intercom

[Tesla140]

As part of flat refurbishment I took this old intercom off and has now been thrown away. I bought a Bell 180, 2017 version thinking it would be a straight swap of the wires, but it does not seem to work no matter how you wire it. Now after looking into it I can see that they would not be compatible as the Bell one is a different version with only 5 inputs whereas this one has 6 inputs (but for some reason only 5 seem to be connected)? It is for a flat in a house divided into 3 flats.

All I have is this picture now, does anyone know which intercom handset would be compatible for a straight swap?

 

[RandomGrinch]

Hi,

Looks like a Bitron AN0002.
Details attached...

A universal handset (with AC Calling) is recommended as a replacement.
https://www.intercomsrus.com/intercom_handset_finder_tool.htm

Your call is on AC, rather than electronic, hence the empty C7 terminal

 

[Tesla140]

That's the one yes!!
Thank you

Would this one be a good universal AC model? https://www.intercomsrus.com/shop/products.php?cat=23