BE4000 does it supports video calling between the phones , hence it supports camera phones but in datasheet it doesn't mentioned's anything about video, but in config guide it has an option of video calling as per the link below.
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I think that the BE4K supports only the registration of VideoPhones, for example 8845G but not video-calling (yet), at least this was my impression at Cisco Live Barcelona 2018.
I will try to get back on this