Hikvision and Yeastar early video

I saw today a new partnership between hikvision and intercom... Sounds great! I watched the new video posted on YouTube and I don't the early video on the indoor and uc clients .. there is only video after you pick up, not before... Isn't this rtsp stream possible for early video? Also for home use, are there affordable Yeastar systems, maybe a budget friendly version? Cause Yeastar is quite expensive if you only want to use it for an intercom? Thnx


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