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300-085 · Question #21

You have configured a Cisco Unity Express server that uses the G.711 codec. You want to send outbound messages in a format that uses lower bandwidth. However, you want to keep the quality of the…

The correct answer is B. Keep the incoming messages as G.711. D. Convert the outgoing messages to G.726. Cisco Unity Express allows independent codec selection for incoming storage and outgoing delivery, enabling quality preservation inbound while reducing bandwidth outbound.

Cisco Unity Connection

Question

You have configured a Cisco Unity Express server that uses the G.711 codec. You want to send outbound messages in a format that uses lower bandwidth. However, you want to keep the quality of the incoming message high. Which two tasks should you perform? (Choose two.)

Options

  • AConvert the incoming messages to G.729a.
  • BKeep the incoming messages as G.711.
  • CConvert the outgoing message to 64 kb/s using G.729a.
  • DConvert the outgoing messages to G.726.
  • ESend the outgoing messages in the G.711 format.
  • FStore the message using the original codec, but convert it to 64 kb/s for outgoing.

How the community answered

(29 responses)
  • A
    3% (1)
  • B
    83% (24)
  • C
    10% (3)
  • E
    3% (1)

Why each option

Cisco Unity Express allows independent codec selection for incoming storage and outgoing delivery, enabling quality preservation inbound while reducing bandwidth outbound.

AConvert the incoming messages to G.729a.

Converting incoming messages to G.729a would degrade quality to 8 kb/s compression, which contradicts the requirement to keep incoming message quality high.

BKeep the incoming messages as G.711.Correct

Retaining incoming messages as G.711 preserves the original 64 kb/s quality, ensuring callers' voicemails are stored at full fidelity as required by the scenario.

CConvert the outgoing message to 64 kb/s using G.729a.

G.729a operates at 8 kb/s, not 64 kb/s, so this description of the codec's bitrate is factually incorrect.

DConvert the outgoing messages to G.726.Correct

G.726 operates at 32 kb/s (half the bandwidth of G.711) while maintaining acceptable audio quality, making it the appropriate codec for bandwidth-reduced outgoing message delivery on Cisco Unity Express.

ESend the outgoing messages in the G.711 format.

Sending outgoing messages in G.711 format maintains the original 64 kb/s bandwidth and does nothing to reduce outbound bandwidth consumption.

FStore the message using the original codec, but convert it to 64 kb/s for outgoing.

Storing in G.711 and converting outgoing to 64 kb/s does not reduce bandwidth since 64 kb/s is already the native G.711 rate, providing no bandwidth savings.

Concept tested: Cisco Unity Express codec selection for message delivery

Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/unity_exp/rel8_6/configuration/guide/b_cue86cg.html

Topics

#codec configuration#G.711#G.729a#bandwidth management

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