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

Remote control