Thank you @joseph_1979 I found a solution.
For future reference:

1. You have to update the firmware of both the NVR and cameras: In my case, the FW of my cameras was 3.0.x, I updated to the v3.1.0.956_22041501 (my camera HW version: IPC_523128M8MP). To update FW of the cameras, you have to do it through NVR, it's not possible to do it anywhere else - docs here: https://support.reolink.com/hc/en-us/articles/900003659286/
2. FW of my NVR was 3.0.x, I updated to the v3.3.0.226_23031609 (my NVR HW version: N3MB01)

After all the firmware updates, I have smart detection alarm delay available both in my Reolink Client and app. Also, not only alarm delay, but I can change the sensitivity for smart detection too - for each category separately: PERSON, VEHICLE, PET.

So if you're facing the same issues with your NVR RLN8-410 (N3MB01) with cameras RLC-820A, follow the bullet points, you'll end up having many more features available, helping you to fine-tune alarm detections and prevent false alarms.

Hi, I updated the firmware on my PoE Doorbell today. Release nota was saying this:

Support calling via Doorbell ring.

However, after the successful update, I cannot see any new option, to set up calling via doorbell ring. How this suppose to work, please? I was waiting for this feature and I want to use it.
I tried to search for this feature in all NVR, Client and phone App - didn't find anything.

My setup is:
1x PoE Doorbell
4x RLC-820A (IPC_523128M8MP)
-> RLN8-410 (NVR) (N3MB01)

@joseph_1979 so it is only working on Android devices, not on iOS? The only thing I am getting is the push notification on my iOS phone app.

@joseph_1979 Thanks for the answer. So if I do understand correctly, this feature is not available yet, right?
I found this thread https://community.reolink.com/topic/9159/ring-ring-reolink-app-v4-43-is-here-answer-calls-from-your-doorbell?post_id=29596 and it was a bit confusing, as there is a printscreen of actual call.

So I cannot have my doorbell calling me on [visitor] (someone pressing the button) currently, right?

Thank you,

Also, my NVR is updated to the latest firmware v3.4.0.293_24010837.
This one should also introduce:
2. Add Time Lapse feature.

But that one is not working either - or I cannot found this option at all.

Hi, I updated the firmware on my PoE Doorbell today. Release nota was saying this:

Support calling via Doorbell ring.

However, after the successful update, I cannot see any new option, to set up calling via doorbell ring. How this suppose to work, please? I was waiting for this feature and I want to use it.
I tried to search for this feature in all NVR, Client and phone App - didn't find anything.

My setup is:
1x PoE Doorbell
4x RLC-820A (IPC_523128M8MP)
-> RLN8-410 (NVR) (N3MB01)

Thank you @joseph_1979 I found a solution.
For future reference:

1. You have to update the firmware of both the NVR and cameras: In my case, the FW of my cameras was 3.0.x, I updated to the v3.1.0.956_22041501 (my camera HW version: IPC_523128M8MP). To update FW of the cameras, you have to do it through NVR, it's not possible to do it anywhere else - docs here: https://support.reolink.com/hc/en-us/articles/900003659286/
2. FW of my NVR was 3.0.x, I updated to the v3.3.0.226_23031609 (my NVR HW version: N3MB01)

After all the firmware updates, I have smart detection alarm delay available both in my Reolink Client and app. Also, not only alarm delay, but I can change the sensitivity for smart detection too - for each category separately: PERSON, VEHICLE, PET.

So if you're facing the same issues with your NVR RLN8-410 (N3MB01) with cameras RLC-820A, follow the bullet points, you'll end up having many more features available, helping you to fine-tune alarm detections and prevent false alarms.

Hi, I bought Reolink kit with NVR RLN8-410 (N3MB01) with 4 cameras RLC-820A.

I have a question regarding person/vehicle detection alarms (push notifications). I am getting a lot of false alarms, especially when it's windy, snowing or raining. A lot of false person/vehicle detections. I was wondering if there is a possibility to have alarm delay on this setup, as I cannot see it in my client, ios app neither web admin environment.

My NVR firmware version is v3.3.0.226_23031609, but I don't know how to update cameras firmware or even where to find info about it's firmware.

Are you planning next firmware version, with support of pet detection and alarm delay? Because without it, the amount of false alarms is preventing me from actually using notifications at all. Or am I doing something wrong? Where to find alarm delays?

Thank you,