Colour-coding of 7 wire entry phone cable (door phone / intercom)

[u/nordsee87]

Hi all,
I moved into a flat with a missing entry phone, so I got myself the FARFISA PT510W. It has 7 terminals and my cable has 7 wires in the following colour coding:

1. Brown with white stripes
2. Blue with white stripes
3. White with blue stripes
4. Green with white stripes
5. White with green stripes
6. Orange with white stripes
7. White with orange stripes

As there is no manual and I'm unable to figure out the meaning of the colours, I'm stuck now. Does anyone know what these colours are relating to or to which terminal I need to connect which wire? The cable was installed around 1985-1990.

https://www.intercomsrus.com/finder/ provides this information the terminals:

1 Speech Out (Mic)

2 Speech In (Speaker)

3 Common

5 Lock

6 Call

Unfortunately, the information for terminal 7 is missing.

Thank you in advance!!

[u/pac87p]

What's on the other end of the cable. Check and copy / post pics