My second WiFi Web cam is the Agasio M166I Wireless WiFI IP Camera with IR-Cut Filter. It has better video quality in both sunlight and total darkness than my Foscam.
The EasyN has some IR mechanical filters! In full sunlight, the IR is blocked by some filter. When you move the cam into the dark, you can hear some clicks and the IR filters are removed. The result is remarkable.
It not only supports Two-Way Audio but it includes a built in microphone and speaker, although the quality is kind of low, I can hear through my cell phone what is happing.
Since the control board is the same as for my Foscam the setup is very similar. Once I got it connected on my WiFi then the setup in zoneminder was exactly the same as for the Foscam, same settings.