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Updated: Aug 01, 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 |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Real Exam Qty: | 55-65 |
| Related Certifications: | Cisco Certified Voice Professional (CCVP) Cisco Certified Network Professional (CCNP) Voice Cisco Unified Communications certification track |
| Certificate Validity Period: | Retired |
| Exam Format: | Multiple choice, Simulations / Simlets (legacy Cisco exam format) |
| 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: Troubleshooting and Operations | - Voice and QoS troubleshooting methodologies - Common VoIP deployment issues |
| Topic 2: VoIP Fundamentals | - Voice over IP architecture and components - Voice codecs and compression techniques - Voice traffic signaling basics |
| Topic 3: Signaling and Call Control | - Gateways and gatekeepers - Dial plans and call routing - SIP, H.323, and MGCP protocols |
| Topic 4: Call Admission Control and Performance | - Voice network performance considerations - Call admission control mechanisms |
| Topic 5: Quality of Service (QoS) | - QoS models and mechanisms - Congestion management and avoidance - Queuing techniques and bandwidth management - Traffic classification and marking |
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:
1. Which command should you use to associate a Session Initiation Protocol phone using a tag of 1 with a directory number with a tag of 20?
A) number 1 dn 20
B) number 20 dn 1
C) button 1:20
D) button 20:1
2. Which Cisco Unified Border Element configuration supports H.323 protocol interworking and address hiding?
A) voice services h323 to h323 h323 interworking media flow-around
B) voice service voip all-connections h323 to r323
C) voice services h323 to h323 h323 interworking media flow-through
D) voice services voip allow-connections h323 to h323 media flow-around
3. How does DiffServ deliver QoS across the network?
A) DiffServ delivers a particular kind of service based on either a flow-based behavior or a per-hop behavior, depending on how the traffic was marked and classified at ingress.
B) DiffServ tries to deliver a particular level of service on a per-flow basis across the network.
C) DiffServ classifies and marks traffic at each node in the network.
D) When using DiffServ, the network tries to deliver a particular kind of service that is based on the QoS that is specified by each packet.
4. Which of the Diffserv differentiated services code point per-hop behaviors is used for low-delay services including VoIP and video over IP?
A) Assured Forwarding
B) Expedited Forwarding
C) class selector
D) default
5. Which statement is true regarding SCCP?
A) A PRI backhaul connection forwards PRI Layer 3 (Q.931) signaling information via a TCP connection from the gateway to the call agent.
B) SCCP supports the widest range of features on Cisco IP phones.
C) SCCP requires a registrar server.
D) The protocol is proprietary to Cisco.
E) Only the IP address is required for the gateway to communicate with Cisco Unified Communications Manager.
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: B | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: D |
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