Since audio recording is restricted to limited applications, I have very little industry experience with this. In my research, I have found that in order for the audio and video to sync, it must be recorded 30 ips per camera @ 4CIF. There are 32 cameras with audio on each port.
Here is my gear:
ACTi XNR-4200 NVR
ACTi, model ACM-3001 ip camera
Louroe Electronics, Verifact A Microphone (Mics powered separately)
I appreciate any advice you may offer!