What does the Survivable Branch Appliance in 3CX allow for?

The Survivable Branch Appliance (SBA) in 3CX is designed specifically to maintain communication capabilities in remote locations during network outages. By functioning as a local server, the SBA ensures that all telephony operations continue uninterrupted, allowing users at branch offices to make and receive calls even when the connection to the main system is lost. This local setup helps maintain business continuity and allows remote employees to stay connected without relying on potentially unstable network connections.

It’s essential to note that while the other options mention benefits that might be associated with other technologies or systems, they do not accurately describe the primary function of the Survivable Branch Appliance. The feature of enhancing network speed, integration with external applications, or improving user interface layouts do not represent the unique capability of providing continued operation during network disruptions, which is the SBA's core purpose.