The business line switches for Omada have telnet and http exposed, and no way to disable using the Controller. See previous post: https://community.tp-link.com/en/business/forum/topic/74656 Planning a

Enable setting DHCP Option 160 from the Omada controller. This is a string value, providing the VoIP device with the URL of its provisioning server. For example, by default Polycom VoIP phones are set