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Session Border Controllers & Cloud Connectivity Flashcards

6 cards from real ACA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In a Microsoft Teams Direct Routing deployment with AudioCodes SBC, what causes a 'TLS Certificate Not Trusted' error during SIP trunk establishment?

    Answer: The SBC certificate is self-signed or its CA is not in Microsoft's trusted root certificate store

    Microsoft Teams requires SBC certificates signed by a CA in its trusted root store; self-signed or private CA certificates will cause TLS handshake failures during trunk establishment.

  2. What does 'SIP Trunking' over an AudioCodes SBC fundamentally replace in legacy enterprise telephony?

    Answer: Traditional ISDN/PRI/BRI physical PSTN trunks with IP-based SIP connections to a service provider

    SIP trunking replaces physical ISDN, PRI, or BRI circuits with IP-based SIP connections to a service provider, delivering PSTN calling over the enterprise IP network.

  3. AudioCodes 'WebRTC' support on the SBC enables:

    Answer: Browser-based clients using WebRTC (VP8/Opus/DTLS-SRTP) to communicate with traditional SIP infrastructure through the SBC

    The AudioCodes SBC bridges WebRTC clients (using DTLS-SRTP and ICE for NAT traversal) with standard SIP infrastructure, enabling browser-based calling without plugins.

  4. Which feature in AudioCodes SBC ensures that media streams reconnect correctly after a brief network interruption without dropping the call?

    Answer: RTP Hold and Resume / Media Re-anchoring

    AudioCodes SBC can detect brief media interruptions and re-anchor RTP streams when connectivity is restored, preventing unnecessary call drops due to transient network issues.

  5. In AudioCodes cloud SBC deployments, 'High Availability (HA)' is typically achieved through:

    Answer: An active/standby pair of SBC instances with automatic failover and shared configuration synchronization

    AudioCodes HA pairs run one active and one standby SBC instance that synchronize configuration and call state, with the standby automatically taking over if the active node fails.

  6. What is 'STUN/TURN' used for in AudioCodes SBC deployments involving WebRTC or remote workers behind NAT?

    Answer: STUN discovers the public IP/port of a NATted client; TURN relays media when direct connectivity fails

    STUN allows clients behind NAT to discover their public IP address and port, while TURN provides a relay server for media when direct peer-to-peer connectivity cannot be established.