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Cisco 642-432 Exam Syllabus Topics:

Cisco Voice Over IP Sample Questions:

Question 1

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 a proprietary signaling type.
Which signaling type will allow you to support your customer?

A. E&M
B. CCS
C. FXS
D. CAS
E. T-CCS
F. FXO

Question 2

Which process changes an internal extension into a fully qualified external PSTN number before matching to a dial peer?

A. forward digits
B. prefix extension
C. digit masking
D. number expansion

Question 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.729ab
B. G.729b
C. G.729
D. G.729a

Question 4

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. All signaling is directly associated with its corresponding voice frame.
D. Signaling bits are sent in a special order in a dedicated signaling frame.

Question 5

Given the SIP network shown in the diagram, identify which two actions are initiated by the UAS (user agent server)? (Choose two.)

A. contacts the user when a SIP invitation is received
B. returns a response on behalf of the user to the invitation originator
C. originates the BYE method to initiate call termination
D. originates the ACK method to indicate that it has received a response to an invitation
E. originates the INVITE method including a description of the session parameters

Solutions: