If you need to reset back to default ONLY the camera IP configuration (and not the rest of the camera configuration) of a CM4x or CM7x, press on the IR remote control the following button combinations:
[*] → [＃] → [Manual]
(Press STAR(*), release, then POUND(#), release, and then press MANUAL. Do not press all buttons at the same time)
This should reset the IP configuration (IP address, gateway, and the DNS server) back to default.
* The default IP address of the CM4x and CM7x series is 192.168.5.163