+1 for SKS 4500/3
I actually can’t find any documentation hinting any encryption except for NFC keys.
This must be documented or every system is using the same key.
Before upgrading to the SKS il vetro, I had a SKS 4500, which depended on the third party chip for converting bus communication for a ATMEGA to read. It was an AS2507T. You can find the datasheet somewhere online (as I am not allowed to upload it here).
If you are up for some soldering, you can still get most SKS intercoms fully working. I have succeeded with the SKS il vetro and the HT4600. I tested it with the HT4600 first as I didn’t want to destroy the much more expensive il vetro if it didn’t work. Fortunately, I got both of them working:
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The picture shows you il vetro, right? How did you connect the HT4600 to the Opener? If you have a diagram or also a photo I could give it a try. I realy want to use the Opener instead of trying to “hack” the bus with a Raspberry or something.
Any regarding the Integration of DS2010 Video?
Cut Loudspeaker (not ground side) and connect PCB side to red/yellow (ring detection)
Connect other side of to green (for ring suppression)
Via next to dip switches connects to blue (open button)
Via labeled Gnd connects to black and violet (ground)
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Great, thx! 
I will give it a try. I think I will conenct the SKS an the Opener with a plug (Molex maybe) to disconnect it easily. I will give you feedback when I’ve tried it.
Please do post results once you got a chance to try this out - much appreciated!
nice! thank you!
so this is the loudspeaker pcb from HT4600 right?
does this only enable “ring to open” or is this able to control the open signal without any ring?
if so, it would be interessting how it could handle multiple doors.
am i right, that this pcb can be connect just in parallel on the bus to existing intercoms?
My Opener works with SKS HT4600 cabled like shown on the photo from @Panda. But actually just the open function. Ring detection doesn’t work yet. I am working on it. I configured my System as “Generic”>“Analogue”.
so you are able to just randomly send an “open” signal without any ring being there?
Thanks a lot for the response! So did you have to irreversibly modify anything to achieve this so far, or were you able to kind of “hook” into it?
I didn’t have any hopes that anything would work, so I just left my HT4600 untouched, but now I might just give this a try as well. 
When I ring my bell manually by pushing the button next to my door I can open the door with the opener. But the opener don’t detect the ring. I think the cabeling is wrong? There is the yellow wire to the speaker and a black wire from the speaker (and all other components in the phone, so it have to be GND). I will draw my cabeling later and post it here. Maybe someone sees the mistake.
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I cabled it like shown below and described by @Panda. Why do the Ring detection not work correctly? Someone an idea? The installation guide in the App says, that I have to connect the orange cable with the mic. But I don’t know what it should be used for.
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You need to contact Georg_S as I have written in my other post for the il vetro. He has to enable analog detection on your Opener. It is not available as a setting to the end user.
Okay, thx! I wrote him a few minutes ago because first I didn’t read that little but important information. Then I will spend my time with soldering it propperly.
IT WORKS!!! SKS HT4600 with Nuki Opener as “Generic”>“Analogue”. I don’t know if @Georg_S programmed my Ring Detection in the last hours or if it works without any changes from an admin. But here are some pictures:
My Adapter "Nuki to Molex"
SKS HT4600 with Molex soldered to PCB and Speaker-Contact
My installation
!!!
I would recommend to let more spare cable to the Opener or using a much more little plug than molex. It was very hard to close the case. I wanted to use a plug because it is not my own flat and i want an easy way to deinstall the opener. If you want you can solder the Opener cable directly to the PCB.
THX @Panda and the others here to find a solution together! If SKS would talk to Nuki (or otherwise) to support this series officialy it would much greater than this DIY solution, but for me it is really ok!
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Hey @DominikZ , thanks a lot for reporting your results here!
Just a couple of questions that would be great if you could clarify.
My understanding is that you cannot trigger opening the door without ringing the bell first, right? Or can you also simply go to the app and hit “Open” and it will buzz you in right away?
So if that’s the case, how has your experience with the “ring to open” feature been? Does it work reliably with this approach?
Just want to make sure it’s worth it before I get to soldering.
Thanks a lot!
Hi!
My understanding is that you cannot trigger opening the door without ringing the bell first, right? Or can you also simply go to the app and hit “Open” and it will buzz you in right away?
Correct! I’ve read some SKS manuals to check this function but all of them say you have to ring the bell first before you can open the door. It has nothing to do with the functionality of nuki but with the configuration of the HT4600 by SKS. Also you can’t open the door by pressing the button on your HT4600 without a bell rang before.
So if that’s the case, how has your experience with the “ring to open” feature been? Does it work reliably with this approach?
Ring-to-Open works perfectly! When I leave the house to walk around with my dog I press the button on the Opener to activate Ring-To-Open and when I come back I ring at the door an Nuki opens the door. Also the Geofencing Ring-to-open works great. I’ve checked it some times and everytime my door was opened by nuki. Also with my brother (I set him up as user for my nuki products). And last but not least, when I ring my bell i can open the door with the app.
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Since Update to Version 1.4.4 of the Opener, everytime I push the Button on the Opener, the loudspeak of the SKS sounds electric. I think there is a fault within the update. Anyone ideas or the same problem?