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Updated: Jul 29, 2026
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Cisco 642-437 Exam Overview:
| Certification Vendor: | Cisco Systems |
| Exam Name: | Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) |
| Exam Number: | 642-437 |
| Available Languages: | English |
| Exam Format: | Multiple choice, Simulations / Simlets (legacy Cisco exam format) |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | Retired |
| Real Exam Qty: | 55-65 |
| Related Certifications: | Cisco Certified Voice Professional (CCVP) Cisco Certified Network Professional (CCNP) Voice Cisco Unified Communications certification track |
| Sample Questions: | Cisco 642-437 Sample Questions |
| Exam Way: | Proctored exam delivered via Pearson VUE test centers or online proctoring (depending on availability at time of offering; exam is retired). |
| Pre Condition: | Recommended experience with Cisco networking fundamentals; often aligned with CCNA-level knowledge or Cisco voice track prerequisites. |
Cisco 642-437 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: VoIP Fundamentals | - Voice codecs and compression techniques - Voice traffic signaling basics - Voice over IP architecture and components |
| Topic 2: Call Admission Control and Performance | - Call admission control mechanisms - Voice network performance considerations |
| Topic 3: Quality of Service (QoS) | - Queuing techniques and bandwidth management - Congestion management and avoidance - Traffic classification and marking - QoS models and mechanisms |
| Topic 4: Signaling and Call Control | - Dial plans and call routing - Gateways and gatekeepers - SIP, H.323, and MGCP protocols |
| Topic 5: Troubleshooting and Operations | - Voice and QoS troubleshooting methodologies - Common VoIP deployment issues |
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:
1. What is the reason that a call succeeds when COR is applied to the incoming dial peer and is equal to or greater than the COR settings that are applied to the outgoing dial peer?
A) The outgoing dial peer, by default, has the lowest priority.
B) The COR list for incoming calls on the incoming dial peer is a superset of COR lists for outgoing calls on the outgoing dial peer.
C) COR lists for incoming calls on the incoming dial peer are not a superset of COR lists for outgoing calls on the outgoing dial peer.
D) The incoming dial peer, by default, has the highest COR priority when no COR is applied.
2. Which four types of ephone-dns are supported by SCCP in Cisco Unified Communications Manager Express? (Choose four.)
A) octo-line
B) single-line
C) dual-line
D) dual-number
E) two directory numbers with one telephone number
F) shared-line, nonexclusive
3. Which dial plan component is responsible for choosing the appropriate path for a call?
A) call route and path selection
B) call coverage and path selection
C) calling privileges
D) endpoint addressing
4. The command address-hiding is entered to enable the SIP-to-SIP address hiding feature. In which configuration mode is this command entered?
A) voice service VoIP configuration mode
B) Cisco Unified Border Element configuration mode
C) SIP configuration mode
D) VoIP dial-peer configuration mode
5. Which command should be included in order to trust the DSCP-marked traffic from the distribution layer?
A) mls qos trust dscp-cos
B) mls qos trust cos
C) mls qos trust dscp
D) mls trust dscp-cos
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A,B,C,D | Question # 3 Answer: D | Question # 4 Answer: A | Question # 5 Answer: C |
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