Q1 Multiple choice Flag Which two functionalities are provided by Session Border Controllers? (Choose two.) Select all that apply. A they span multiple networks and provide edge proxy functions between them B they are session-aware devices that enable control of end-to-end interactive communications across PSTN network borders C they enable premium interactive services across IP network borders by complementing existing edge routers D they provide routingfunctions for IP, TCP, and SMTP using application parameters. E they replace typical edge routers and firewalls in order to provide a unified network border for signaling and media control Correct answer