These are all the same model software-wise, but the mounting is different.
DS-KD8003: the actual doorbell module with nothing else. Same as DS-KD8003-IME1. Needs a housing to install (with 1, 2 or 3 modules).
DS-KD8003-IME1/S: silver version of the doorbell.
DS-KD8003/Surface: Module with...
I managed to get the DS-KD8003-IMEI to communicate with the indoor DS-KH6320 again. I think the trick was to set the SIP server to 0.0.0.0? Not sure if it's stable though...
Now I noticed after the doorbell firmware upgrade, my Hikvision NVR kept crashing. I had to remove the camera from the NVR...
Did you manage to fix it? I have the same issue currently, so there's currently no doorbell...
I'm getting call failed on the DS-KD8003-IMEI. From the DS-KH6320 I can access the doorbell/camera just fine.