Make the sub stream default?

[otrada-genius 0]

Hey colleagues! I have an issue about dual streaming feature. I have Dahua NVR4416-16P host device and Dahua IP-cameras.

Registrators locate in different buildings, buildings link between themselves by confined (about 2MBps) channel.

Smart PSS gives an opportunity to choicing displaying channel - Main Stream or Sub Stream, but Main stream is selected by default. So, clients of course can't use right button to switch mode and look a big-picture stream by weak internet.

How can I configure my system that clients look a substream on SPSS by default, but record MainStream - is only for record.

Thx and sorry about my language) I have not Down's syndrome, just foreigner =)