User Guides / Manuals
Here are a few guides and manuals that may help if you have common issues with your system
Hikvision Camera systems
https://supportusa.hikvision.com/support/search?term=user+guide
Axis Camera systems
https://help.axis.com/en-us?language=en-us
Kantech Access control
https://www.kantech.com/resources#first=10&sort=%40rptitle%20ascending&f:DocumentType=[User%20Guide]
Rio Link Wireless Camera System
Yealink Phone