Which two statements describe the functions of Session Border Controllers? (Choose two.)
they replace typical edge routers and firewalls in order to provide a unified network border for signaling and media control
they are session-aware devices that enable control of end-to-end interactive communications across IP network borders
they are based on the Windows operating system
they provide routing functions for IP, TCP, and SMTP using application parameters
they provide signaling proxy functions for SIP, H.323, and MGCP, which includes access control, signaling constraints, and topology hiding
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