Instant Download Cisco : 642-432 Questions & Answers as PDF & Test Engine
Updated: Sep 15, 2026
No. of Questions: 72 Questions & Answers with Testing Engine
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Cisco 642-432 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Quality of Service (QoS) for Voice | - Voice traffic prioritization
|
| Topic 2: Call Control and Survivability | - SRST (Survivable Remote Site Telephony)
|
| Topic 3: Voice Gateway and Protocol Integration | - PSTN integration
|
| Topic 4: Cisco Unified Communications Architecture | - Call processing design
|
| Topic 5: IP Phone Deployment and Features | - Advanced telephony features
|
Cisco Voice Over IP Sample Questions:
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. QSIG
- C. E&M
- D. CAS
- E. CCS
- F. T-CCS
Correct Answer: C 🗳️
Examine the example output.
hostname GW1 ! interface Ethernet 0/0 ip address 172.16.2.1 255.255.255.0 h323-gateway voip interface h323-gateway voip id GK1-zone1.abc.com abc.com ipaddr 172.16.2.2 h323-gateway voip h323-id GW1 h323-gateway voip bind srcaddr 172.16.2.1 ! dial-peer voice 1 voip destination-pattern 1212. session-target ras ! dial-peer voice 2 pots destination-pattern 2125551212 no register e164 !
end
Choose the command that will restore communication with gatekeeper functionality to this device.
- A. h323-gateway voip bind srcaddr 172.16.2.2
- B. h323-gateway voip GW1-zone2.abc.com abc.com ipaddr 172.16.2.1
- C. gateway
- D. h323-gateway voip h323-id GK1
Correct Answer: C 🗳️
You have a customer that is interested in determining the number of VoIP calls their Frame Relay WAN links can support. Each of their Frame Relay WAN links has 84 kbps of bandwidth available outside all other applications and overhead. How many G.729 calls using the 8 kbps codec and 20 byte sample size can be supported?
- A. 3
- B. 2
- C. 1
- D. 4
Correct Answer: A 🗳️
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.729B
- B. G.726
- C. G.723.1
- D. G.711
Correct Answer: A 🗳️
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. FXO
- B. E&M
- C. FXS
- D. CAS
- E. CCS
- F. T-CCS
Correct Answer: F 🗳️
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