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Cisco Voice Over IP Sample Questions:

1. You have a pair of voice enabled routers capable of supporting only medium complexity codecs. You need to conserve bandwidth on WAN links without major impact to call quality. Which two codecs will satisfy these requirements? (Choose two.)

A) G.729
B) G.729a
C) G.729b
D) G.729ab

2. You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs use an in-band signaling type.
Which signaling type will allow you to support your customer?

A) E&M
B) T-CCS
C) QSIG
D) CCS
E) FXO
F) CAS

3. You are meeting with a customer that has deployed IP telephony at their headquarters
location. They would like to roll out IP telephony to their regional office as well. They are now using the G.711 codec at headquarters. They want to be able to maximize the number of calls carried without impacting voice quality or forcing a WAN upgrade. Which codec would be appropriate for their WAN?

A) G.723.1
B) G.711
C) G.726
D) G.729B

4. Which three are supervisory signals? (Choose three.)

A) busy
B) off hook
C) ring
D) on hook
E) call waiting

5. Which problem does a-law and mu-law address?

A) quantization produces higher signal-to-noise ratios at smaller amplitudes
B) quantization produces distortion at higher frequencies
C) encoding loses signal integrity at lower frequencies
D) encoding produces greater signal loss at higher amplitude

Solutions: