Replacement of the intercom in the apartment - in a high-rise building

If we are talking about this analog system from which my colleague started the topic:
1.replace the control panel (power supply) + external panel or its insert (loudspeaker, microphone with board), correct connections in the wiring. Once the shaft is healthy, you can take a look at the headphones. We start with cleaning the isostats with the liquid contact S.

2. Say goodbye to the analog dragon and switch to the digital tz system (urmet, proel, laskomex, ACO, Elfon and what else, who likes, maybe except for the Chinese who introduces himself as Genway)

The crash (gurgling) occurs in a completely different building, it has nothing to do with my previous posts. Now, my neighbors have this annoyance, and me too, but not all of them. We have different uniphones, regardless of whether one is brand new, someone is older - it growls identically, and it was good for years. I repeat for many it is still very clean. I understand the dragon, but replacing the layout with everyone is a serious investment for a dozen or so apartments, older people - I can't do it.

Low pay at weddings? I do not understand why a colleague does the repair of intercoms without a clue ...
Maybe a colleague will write which system we are dealing with this time?
Did a friend check with everyone, or is he just based on what someone said?

It wasn't necessary with these weddings, I don't know what's going on ...
- I checked with everyone except those who were not at home.

I repeat the question.

suworow wrote:

Maybe a colleague will write what system we are dealing with this time?

Identification will not be easy, but I will try to take some photos today, look inside.
This arrangement is 20 years old, although it is doing well. A small black plastic box hangs somewhere on the cage under the ceiling, a cassette by the "gate", metal buttons arranged vertically, typical for those times, with a name next to each, and uniphones, as I mentioned, "everyone has a different one" and I connected it somehow, because it broke, because the dog he knocked off and chewed etc.
5-cable system.
I do it because the apartment block is inhabited only by older people, who will never be repaired by anyone, unless I do it.
I had to pull new cables for many, because when replacing the door to a private apartment, they simply cut it off, bricked it up there ...
The main door in the block was replaced, so I improved the intercom, which had been dead for years, to make it function somehow.
Edit:
I add photos:
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Yesterday I was connecting a neighbor with a new uniphone, it was necessary to drill, extend the cut wires, etc., and suddenly all the growls, beautiful silence and clear operation of the system disappeared, and then it reappeared. At home, I pressed the electric strike button a few times and again the growl subsided. Where is it coming from?

Darek A. wrote:

Identification will not be easy, but I will try to take some photos today, look inside.

Identification is very simple. This is a classic analog multi-wire system. You can read more about it in these topics:
https://www.elektroda.pl/rtvforum/topic3577121.html
https://www.elektroda.pl/rtvforum/topic3422654.html
When you start repairing anything, it is worth at least knowing what you are dealing with.

Darek A. wrote:

and uniphones, as I mentioned, "everyone has a different one" and I connected it somehow, because it broke, because the dog knocked it down and bit it, etc., so they bought what they managed, what the guest advised in the shop.

I probably did not advise badly since they work. It is an open system in which uniphones of many manufacturers can work. Yes, they may differ slightly, for example, in the volume level and it is sometimes difficult to balance such a system so that everyone can be heard reasonably well. In this topic, a colleague will find a list of compatible uniphones:
https://www.elektroda.pl/rtvforum/topic3289894.html

Darek A. wrote:

Yesterday I was connecting a neighbor with a new uniphone, it was necessary to drill, extend the cut wires, etc., and suddenly all the growls, beautiful silence and clear operation of the system disappeared, and then it reappeared. At home, I pressed the electric strike button a few times and again the growl subsided. Where is it coming from?

Nothing comes to mind at the moment, although it seems to me that I have already had such a case ....
Either way, I would start by tidying up the cabling. The hum can be generated by the power supply itself. And it's not that the sound is just an electro-catch activating itself? You can, for example, start with its repair / inspection, but on the other hand, the new control unit costs up to PLN 100. The new "electronics" for the external panel is a maximum cost of PLN 50. I might be wrong, but it looks like FIM-PRO.

Darek A. wrote:

I do it because the apartment block is inhabited only by older people, who will never be repaired by anyone, unless I do it.

I think my friend is a bit more dramatic. There are no intercom companies in Szczecin?
And as we are with older people. The new digital intercom is a great help for them when opening the door (key rings). If not a new intercom, maybe you should think about adding a combination lock with an RFID reader.
greetings