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Cisco Voice Over IP Sample Questions:

1. You have been forwarded some questions by a prospective VoIP customer who would like to know the Cisco default sample size for the G.729 codec. What is it?

A) 10 ms
B) 40 ms
C) 20 ms
D) 30 ms

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 Wink-Start signaling.
Which signaling type will allow you to support the customer?

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

3. 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.729ab
D) G.729b

4. Which statement is true about only out-of-band signaling?

A) All voice packets carry their own signaling.
B) A signaling bit is robbed from each frame.
C) Signaling bits are sent in a special order in a dedicated signaling frame.
D) All signaling is directly associated with its corresponding voice frame.

5. A particular set of H.323 endpoints cannot resolve the IP address of destination endpoints. What is the H.323 approved method to fix this problem?

A) Introduce a gatekeeper on the segment.
B) Build route tables in gateways on the segment.
C) Hard code all IP addresses.
D) Choose another signaling protocol.

Solutions: