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Cisco Voice Over IP Sample Questions:

1. Which device is used to allow an H.323 stream to transit a firewall?

A) MCU
B) gatekeeper
C) gateway
D) proxy

2. 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) 30 ms
B) 20 ms
C) 10 ms
D) 40 ms

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

A) A signaling bit is robbed from each frame.
B) All voice packets carry their own signaling.
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.

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

5. What is the function of a SIP registrar server?

A) routes service requests
B) acquires endpoint addresses
C) resolves active endpoint addresses
D) resolves text addresses to IP addresses

Solutions: