Ol... call it a reservation...whatever. that terminology and procedure may also vary from router to router... my current router calls it a 'reservation'... a previous router called it 'static'... I won't get into professional standard procedures, or semantics discussions. We're not all IP. IT, whatever, 'professionals'... and I can only offer my experience.
The point is that the camera or other WAN accessible device's LAN address would remain static. Port forwarding is necessary to connect to device from WAN. projecting that LAN "non-dynamic' or whatever camera outside the network... as I understand it, and has worked for me for 12 years on 3 different routers...on a LAN with 19 devices..... DNS wasn't mentioned, but some service should be used to mitigate provider changing the local network Moderm address.
I know Some colleagues using proprietary router/modem combos supplied by certain providers don't like to do port forwarding... and that's been a PITA for them, at least initially.
...but it seems to me that anyone who would go to the trouble to put up advanced PWS information would obtain at least a router that would provide a permanent location for the devices sending data...
The original poster asked about types of cameras... Mine are three Logitech C910's or C920's. USB amd three Hikvision 2CD2032POE.... been down the 'wireless' road... Wired is better, for me.