Is There A List Of Cameras That Allow 3rd Party Push?

I just had a conversation with an NVR manufacturer that cannot answer a straight forward question. It is more than likely he honestly can't answer the question. Most manufacturers integrate cameras into their NVR or software, but not fully. The level of integration can be somewhere between 0 and 60. Does anyone know how I might find out if a camera manufacturer allows 3rd party push from an NVR without an SDK? Thanks,

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