It depends which version of the 8003 door station you have. I've just had a look at the firmware release notes for the B version and, like the model I have (6113,) they've added the mechanical door bell function in the latest firmware. That allows you to reprogram Relay 2 in the door station to 'mechanical doorbell'. When the call button is pressed it will pulse (very) briefly, so that relay can be connected to 'some' other device that will accept a common/normally open trigger. For domestic situations I connect the output across a wireless doorbell push.
You will see from one of my posts a couple of days ago that there's a small issue, in that the relay pulse is so brief (1/10th of a second or so), that some connected devices do not register it. I've e mailed Hikvision support with a description of the problem in the hope that it will be resolved in another firmware update.
The release notes detailing the function are here: