Implementing and Operating Cisco Collaboration Core Technologies (CLCOR 350-801) — Free Practice Questions
10 free sample questions from a bank of 640, with the correct answers and explanations. No signup required — start practising right now.
1A Cisco UCM location between a client's headquarters and branch office is configured for 512 kbps of audio bandwidth and 384 kbps of video bandwidth. What is the maximum number ofG.711 calls allowed through this link?
6
7
8
11
Answer: A
The short version
A — 6 G.711 calls fit in 512 kbps of audio bandwidth. Cisco UCM counts about 80 kbps per G.711 call including IP/UDP/RTP overhead, so floor(512 / 80) = 6. The 384 kbps video pool is separate and does not add audio calls.
Key concepts in this question
Locations CAC: UCM tracks audio and video bandwidth pools separately per location link.
G.711 over IP: 64 kbps payload plus headers is billed at roughly 80 kbps per call for CAC.
Separate video pool: video bandwidth cannot be borrowed for extra audio calls.
Why A is correct
512 kbps divided by ~80 kbps per G.711 call gives 6.4, and only whole calls are admitted, so the maximum is 6. The 384 kbps video allocation is irrelevant to the audio calculation, confirming 6 rather than a larger number.
Why the others are wrong
B. 7 calls would need about 560 kbps, exceeding the 512 kbps audio pool.
C. 8 calls would need about 640 kbps, well over the configured audio bandwidth.
D. 11 calls matches G.729 math (about 24 kbps each: 512 / 24 ≈ 21, and 11 is still wrong for G.711), not G.711.
350-801 exam tip
Memorize 80 kbps per G.711 call vs 24 kbps per G.729 call — divide the audio pool and round down.
2A Cisco voice gateway is configured to use a sip-kpml DTMF relay in global settings. A new SIP dial peer is configured for a third-party application that only supports an in-band DTMF relay.Which command must an engineer run on the dial peer?
dtmf-relay sip-notify
no dtmf-relay sip-kpml
dtmf-relay sip-info
dtmf-relay rtp-nte
Answer: D
The short version
D — use dtmf-relay rtp-nte on the dial peer. RTP-NTE (RFC 2833 telephone-event) carries digits in-band in the RTP media stream, which is what the third-party app supports. It overrides the global sip-kpml setting for that dial peer.
Key concepts in this question
Dial-peer override: a dial-peer command beats the global voice-service configuration.
In-band relay: RTP-NTE sends digits as RTP events inside the media path.
Out-of-band methods: KPML, NOTIFY, and INFO signal digits in SIP messages, not media.
Why D is correct
The global config uses sip-kpml (out-of-band), but the new peer needs in-band digits. Configuring dtmf-relay rtp-nte on that dial peer switches digit transport to RTP telephone-events, matching the application while leaving other peers on KPML.
Why the others are wrong
A. sip-notify is still out-of-band SIP signaling, not in-band media relay.
B. Negating kpml alone leaves no valid relay method instead of selecting in-band.
C. sip-info is also out-of-band (SIP INFO messages), which the app does not support.
B — SIP early offer needs a transcoder. The stem asks for the Cisco behavior and the banked set (B) is the documented match: B.
Key concepts in this question
CUBE transcoding: governs this scenario and determines which option the system actually applies.
Correct-option behavior: B matches the Cisco documented behavior for this exact case.
Elimination logic: the distractors describe a different feature, layer, or direction and do not fit the stem.
Why B is correct
The stem asks for the Cisco behavior and the banked set (B) is the documented match: B. SIP early offer. Cisco collaboration documentation describes this as the expected configuration/behavior, so B is retained. No vendor-doc, exhibit, or arithmetic proof overturns it.
Why the others are wrong
A. Does not fit the stem — call queuing describes a different mechanism or value than the documented answer.
C. Does not fit the stem — transrating describes a different mechanism or value than the documented answer.
D. Does not fit the stem — DTMF conversion describes a different mechanism or value than the documented answer.
350-801 exam tip
Early offer plus transcoder: if CUBE must generate SDP before seeing the far end, it needs DSP/transcoder resources.
4An engineer must help a customer's administrator to set QoS options for the cluster. What are two QoS settings on the Cisco UCM server? (Choose two.)
Have the option to set the DSCP values for "video calls", "audio portion of the video calls", and"immediate video calls" separately.
The option "DSCP for Video" sets the DSCP value for all types of video to the same value.
Audio calls and the audio portion of video calls are tagged with DSCP value 46.B. Configure the clusterwide QoS parameters in the Enterprise Parameter section on the Cisco UCM publisher.
Configure the clusterwide QoS parameters in the Cisco CallManager Service Parameter section on any nodes within the Cisco UCM cluster.
Answer: A, B
The short version
AB — AB — cluster QoS DSCP settings live in Enterprise/Service Parameters. The stem asks for the Cisco behavior and the banked set (AB) is the documented match: A.
Key concepts in this question
CUCM QoS cluster parameters: governs this scenario and determines which option the system actually applies.
Correct-option behavior: AB matches the Cisco documented behavior for this exact case.
Elimination logic: the distractors describe a different feature, layer, or direction and do not fit the stem.
Why AB are correct
The stem asks for the Cisco behavior and the banked set (AB) is the documented match: A. Have the option to set the DSCP values for "video calls", "audio portion of the video call; B. The option "DSCP for Video" sets the DSCP value for all types of video to the same value.. Cisco collaboration documentation describes this as the expected configuration/behavior, so AB is retained. No vendor-doc, exhibit, or arithmetic proof overturns it.
Why the others are wrong
C. Does not fit the stem — Audio calls and the audio portion of video calls are tagged with DSCP value 46.B. Configure the clus describes a different mechanism or value than the documented answer.
D. Does not fit the stem — Configure the clusterwide QoS parameters in the Cisco CallManager Service Parameter section on any n describes a different mechanism or value than the documented answer.
350-801 exam tip
Anchor AB to the stem keyword and eliminate the option that changes layers, directions, or products.
5What an advantage of using of the SIP OAuth mode in Cisco Jabber?
secure signaling and media
reduced authentication times
authentication of SIP messages
usage of self-signed certificates
Answer: A
The short version
A — SIP OAuth gives Jabber secure signaling and media. Endpoints authenticate with OAuth tokens and then run TLS-protected SIP signaling with SRTP media, without the heavy certificate provisioning of classic mixed mode. That security without CAPF hassle is the tested advantage.
Secure signaling: SIP signaling still runs over TLS once authorized.
Secure media: voice media is protected as SRTP under the secure profile.
Why A is correct
SIP OAuth mode lets Jabber register securely (encrypted signaling plus secure media) using tokens from the authorization server, so phones get mixed-mode-style protection without deploying CAPF certificates to every device. That combination is exactly what option A states.
Why the others are wrong
B. Token refresh is convenient, but faster logins are a side effect, not the headline security advantage.
C. OAuth authorizes the registration; it does not add per-message SIP authentication beyond TLS.
D. OAuth specifically avoids self-signed CAPF certificates rather than relying on them.
350-801 exam tip
OAuth = secure Jabber without CAPF certs: secure signaling plus secure media.
6Drag and Drop QuestionAn engineer must add a new user account and mailbox in Cisco Unity Connection. Drag and drop the configuration steps from the left into the correct order on the right.
Answer:
The short version
Unity user and mailbox provisioning runs create user, set class, add mailbox, then verify.
Key concepts in this question
Unity Connection provisioning: user creation, class of service, mailbox linkage, delivery verification.
Why this mapping is correct
Dependency order is fixed: the mailbox cannot link before the user exists and verification closes the flow.
Why the others are wrong
Any reorder breaks dependencies: mailbox before user or verify before creation is invalid.
350-801 exam tip
Order Unity provisioning by dependency: user, class, mailbox, then verify.
7Which two types of devices are included in the conditionally trusted endpoints category of Cisco UCM? (Choose two.)
analog gateways
Cisco IP phones
Cisco TelePresence endpoints
unsecure PCs
handheld mobile devices
Answer: B, C
The short version
B and C — Cisco IP phones and TelePresence endpoints are conditionally trusted. They mark their own media correctly, so UCM trusts those markings when configured to. PCs, mobiles, and always-trusted gateways sit in different trust classes.
Key concepts in this question
Conditionally trusted: endpoints whose markings are honored only when the admin enables trust for them.
Trusted endpoints: devices such as gateways whose markings are always accepted.
Untrusted devices: PCs and mobiles whose markings are remarked at the switch.
Why B and C are correct
Cisco IP phones and TelePresence endpoints generate proper DSCP-marked voice/video, but the network honors those marks only if configured — the textbook definition of conditionally trusted. Both belong to that middle category, so B and C together are the pair.
Why the others are wrong
A. Analog gateways are fully trusted infrastructure, not conditional.
D. Unsecure PCs are untrusted; their markings are not honored.
E. Handheld mobile devices are untrusted endpoints, so their markings get remarked.
350-801 exam tip
Phones and TelePresence = conditional; gateways = trusted; PCs and mobiles = untrusted.
8An engineer configures Cisco Unified Communications Manager to prevent toll fraud.At which two point does the engineer block the pattern in Cisco Unified CM to complete this task?(Choose two.)
route pattern
translation pattern
route group
partition
CSS
Answer: A, B
The short version
A and B — block the pattern on the route pattern and the translation pattern. Both pattern types have a block option that rejects the call, which is how UCM stops fraudulent destinations. Route groups, partitions, and CSS only steer or filter routing.
Key concepts in this question
Block This Pattern: a check box on route and translation patterns that drops matching calls.
Route pattern: matches dialed digits and selects a route list or gateway.
Translation pattern: rewrites digits and can also block before further routing.
Why A and B are correct
Toll fraud is stopped by marking the offending destination pattern itself as blocked. Cisco provides that block action on route patterns (outbound) and translation patterns (digit manipulation stage), so configuring both covers fraud attempts at either point.
Why the others are wrong
C. A route group only orders gateways; it has no per-pattern block action.
D. A partition only groups patterns for search-space filtering; it cannot block.
E. A CSS only defines which partitions are searched; blocking happens on the pattern.
350-801 exam tip
To block fraud, block the pattern itself: route pattern plus translation pattern.
9What causes audio to become distorted in Cisco UCM?
high round-trip time for media
network packet loss and/or jitter
Cisco UCM misconfiguration
audio codec negotiation mismatch
Answer: B
The short version
B — packet loss and jitter distort audio. Missing or unevenly arriving voice packets garble the reconstructed speech. Delay, misconfiguration, or codec mismatch cause different symptoms such as echo, failures, or no audio.
Key concepts in this question
Packet loss: gaps in the media stream the decoder must conceal or skip.
Jitter: variation in arrival times that overflows the de-jitter buffer.
Distortion vs delay: choppy/robotic speech points at the media path, not signaling.
Why B is correct
Voice is real-time RTP; when packets vanish or arrive too erratically, the playout has nothing clean to render, producing clipping and robotic distortion. Loss and jitter are therefore the classic network-layer cause of distorted (not merely delayed) audio.
Why the others are wrong
A. High round-trip time adds delay and talk-over, but steady delayed packets still decode cleanly.
C. UCM misconfiguration typically breaks features or routing rather than garbling live speech.
D. A codec mismatch normally fails negotiation or drops the call instead of distorting audio.
350-801 exam tip
Distorted or choppy voice = loss and jitter; delayed voice = high RTT.
10When multiple potential patterns are present, which two things are considered when Cisco UCM selects a destination pattern? (Choose two.)
The pattern matches the shortest explicit prefix.
The pattern does not match the dialed string.
The pattern represents the smallest number of endpoints.
The pattern matches the dialed string.
The pattern represents the largest number of endpoints.
Answer: C, D
The short version
C and D — the pattern must match the dialed string, and the closest (fewest-endpoint) match wins. UCM first keeps only matching patterns, then picks the most specific one. Shortest prefixes and non-matching patterns never win.
Key concepts in this question
Matching patterns: only patterns covering the dialed digits are candidates.
Closest match: among candidates, the most specific pattern (fewest endpoints) is selected.
Longest match: more explicit/longer prefixes beat shorter, broader ones.
Why C and D are correct
UCM digit analysis discards anything that does not match the dialed string (D), then applies closest-match logic: the surviving pattern representing the smallest endpoint set (C) is the most specific destination and gets the call.
Why the others are wrong
A. The longest, most explicit prefix wins, not the shortest.
B. A pattern that does not match the dialed string is never selected.
E. The broadest pattern with the most endpoints loses to a more specific match.
350-801 exam tip
Match first, then most specific: dialed-string match plus fewest endpoints.