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

The SIP proxy port is blocked by a firewall

Answer

The SRTP profile does not match

Answer

The SIP trunk FQDN contains an underscore

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

Internal IP phone-to-PBX signaling

Answer

H.323 video conferencing trunks

Answer

Analog POTS lines to fax machines only

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

Physical IP phones to use WiFi instead of Ethernet

Answer

Fax relay over browser interfaces

Answer

Video calls between PSTN endpoints

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

SIP Session Timer Re-INVITE

Answer

SRTP Key Re-negotiation

Answer

RTCP Goodbye suppression

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

A single SBC with RAID storage redundancy

Answer

Multiple independent SBCs with no shared state

Answer

Load balancing RTP across all available SBCs randomly

Question 6

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

Accepted Answer

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

Answer

STUN encrypts SIP headers; TURN encrypts RTP media

Answer

STUN authenticates SIP registrations; TURN manages TLS certificates

Answer

STUN measures round-trip delay; TURN adjusts jitter buffer depth