ACA Session Border Controllers & Cloud Connectivity 3

Question 1

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

Accepted Answer

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

Answer

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.

Question 2

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

Accepted Answer

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

Answer

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.

Question 3

AudioCodes 'WebRTC' support on the SBC enables:

Accepted Answer

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

Answer

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

Question 4

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

Accepted Answer

RTP Hold and Resume / Media Re-anchoring

Answer

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.

Question 5

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

Accepted Answer

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

Answer

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.

ACA - Audiocodes Certified Associate Practice Test

ACA - Audiocodes Certified Associate Practice Test

ACA Session Border Controllers & Cloud Connectivity 3