Look at this page, use g.tr to change to eng:
https://www.janexint.com.pl/wideodomofony-ip-dahua/
Devices that have been taken out of production, but it is still possible to make a firmware update with support for SIP 2.0: - VTH1510CH - VTH1550CH - VTH1550CHM - VTH1550CHW-2 - VTH1560B (W) -...