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Session Border Controllers & Cloud Connectivity Flashcards

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  1. What is the primary function of an AudioCodes Session Border Controller (SBC)?

    Answer: To act as a security and interoperability border element between SIP domains, handling signaling and media for all calls crossing the boundary

    An SBC sits at the border between networks (e.g., enterprise and SIP trunk provider) and performs security enforcement, topology hiding, interoperability fixes, and media anchoring for all cross-domain calls.

  2. AudioCodes Mediant SBC 'Teams Direct Routing' mode enables:

    Answer: Microsoft Teams Phone System to use AudioCodes SBC as a certified gateway to PSTN SIP trunks

    Teams Direct Routing allows enterprises to connect their own PSTN SIP trunks through a Microsoft-certified SBC (such as AudioCodes Mediant) to the Teams Phone System cloud.

  3. Which certification must an AudioCodes SBC obtain to be used in Microsoft Teams Direct Routing deployments?

    Answer: Microsoft Teams Direct Routing certification (published on Microsoft's qualified SBC list)

    Microsoft publishes a list of SBCs certified for Teams Direct Routing; AudioCodes Mediant SBCs appear on this list after passing Microsoft's interoperability testing requirements.

  4. In AudioCodes SBC for Teams Direct Routing, which SIP transport is mandated by Microsoft for the SBC-to-Teams signaling connection?

    Answer: TLS (TCP with TLS encryption)

    Microsoft requires TLS for all SIP signaling between the certified SBC and the Microsoft Teams infrastructure to ensure signaling security and meet compliance requirements.

  5. What AudioCodes product is purpose-built as a cloud-native SBC deployable on Azure, AWS, or Google Cloud?

    Answer: AudioCodes Mediant Cloud Edition (CE) SBC

    The Mediant Cloud Edition (CE) is AudioCodes' virtual SBC designed for cloud environments, available as VM images on major cloud platforms for scalable cloud-native deployments.

  6. In AudioCodes SBC deployments, 'B2BUA' (Back-to-Back User Agent) mode means:

    Answer: The SBC terminates each SIP dialog independently and creates a new outgoing dialog, fully controlling both call legs

    In B2BUA mode the SBC appears as the endpoint to both sides, maintaining independent SIP dialogs on each leg, giving it full control over signaling, headers, and media for security and interoperability.