ACA Quality of Service & Media Handling

Question 1

Which DSCP value is recommended by Cisco and widely used for marking VoIP RTP media traffic to ensure priority queuing?

Accepted Answer

EF (Expedited Forwarding, DSCP 46)

Answer

AF41 (DSCP 34)

Answer

CS3 (DSCP 24)

Answer

BE (DSCP 0)

Question 2

In AudioCodes Mediant, which parameter configures the DSCP value applied to outgoing RTP packets?

Accepted Answer

Premium Service Class Media (PremiumServiceClassMedia)

Answer

Voice Quality DSCP

Answer

RTP Type of Service

Answer

Media Priority Tag

Question 3

What is the primary purpose of a jitter buffer in VoIP media processing?

Accepted Answer

To absorb network delay variation and deliver audio packets to the codec at a steady rate

Answer

To compress audio samples before transmission

Answer

To detect and suppress background noise

Answer

To reorder out-of-sequence TCP segments

Question 4

AudioCodes Mediant supports which type of jitter buffer that automatically adjusts its depth based on network conditions?

Accepted Answer

Adaptive jitter buffer

Answer

Fixed jitter buffer

Answer

Static jitter buffer

Answer

Buffered playout jitter

Question 5

What is Packet Loss Concealment (PLC) in AudioCodes media processing?

Accepted Answer

An algorithm that synthesizes substitute audio when RTP packets are lost, reducing perceived quality degradation

Answer

A method to retransmit lost RTP packets

Answer

A codec that adds FEC redundancy to each RTP packet

Answer

A feature that mutes audio when loss exceeds a threshold

Question 6

Which MOS (Mean Opinion Score) threshold is typically considered the minimum acceptable quality for enterprise VoIP calls?

Accepted Answer

3.6

Answer

2.5

Answer

4.5

Answer

5.0