SkillTestPro | CCNP Collaboration 300-815 CLACC Practice Test 11

CCNP Collaboration 300-815 CLACC Practice Test 11 (Hard) - Configuring Advanced SIP Interop with CUBE - LTI Transcoders and Filtering/Blocking Mid-Call Signaling

CCNP Collaboration Exam Questions

1 / 10

Which CUBE feature uses a local hardware or software-based transcoding resource, invoked directly by the CUBE router itself rather than through an external MRF, to convert media between incompatible codecs on a call?

A feature that only changes the router's chassis LED color when transcoding is needed

Local Transcoding Interface (LTI), which allows CUBE to invoke local DSP-based transcoding resources directly for codec conversion

A feature that only changes the router's power supply brand when transcoding is needed

A feature that only changes the router's rack mounting position when transcoding is needed

A feature that only changes the router's console banner message when transcoding is needed, which is inconsistent with expected behavior

A feature that only changes the router's fan speed profile when transcoding is needed

2 / 10

Which resource must typically be available and properly provisioned on a CUBE router for LTI-based transcoding to succeed on a call requiring codec conversion?

A specific console banner message configured on the router

A specific rack mounting position configured for the router, in accordance with common design practices, in most deployment scenarios, in most deployment scenarios

Sufficient DSP (digital signal processor) transcoding resources allocated and available on the router to handle the codec conversion for that call

A specific fan speed profile configured on the router

A specific chassis LED color configured on the router

A specific power supply brand installed in the router

3 / 10

Which symptom would most likely indicate that a call requiring LTI-based transcoding failed due to insufficient DSP resources being available on the CUBE router at the time of the call?

The call fails to establish, or falls back to a lowest-common-denominator codec if available, with debug or syslog output indicating a transcoding resource allocation failure

The call connects successfully but the phone's power supply hums at a different pitch

The call connects successfully but the phone's fan spins at an unexpected speed

The call connects successfully but the phone's rack mounting bracket loosens unexpectedly

The call connects successfully but the phone's console banner message displays in the wrong language, which is inconsistent with expected behavior, which is inconsistent with expected behavior

The call connects successfully but the phone's chassis LED blinks at an unexpected rate

4 / 10

Which CUBE capability allows specific mid-call SIP signaling messages, such as an unwanted re-INVITE or UPDATE from one call leg, to be filtered or blocked from reaching the other call leg?

A feature that only filters the router's chassis LED color changes during a call

A feature that only filters the router's console banner message changes during a call, which is inconsistent with expected behavior, under typical configuration conditions, regardless of the platform version in use

A feature that only filters the router's power supply brand changes during a call

A feature that only filters the router's fan speed profile changes during a call

A feature that only filters the router's rack mounting position changes during a call

SIP signaling filtering or blocking configured through voice class SIP profiles or related mechanisms, which can suppress or modify specific mid-call messages before they are forwarded to the other leg

5 / 10

Which scenario would most justify configuring CUBE to filter or block a specific mid-call re-INVITE from one call leg rather than passing it through unmodified?

A requirement that the router's power supply brand remain unchanged during any re-INVITE

A requirement that the router's chassis LED color remain unchanged during any re-INVITE

The receiving leg's endpoint does not correctly support the renegotiation being requested (such as an unsupported codec change or hold request), and passing the re-INVITE through unmodified would cause that endpoint to reject the call or drop media

A requirement that the router's rack mounting position remain unchanged during any re-INVITE

A requirement that the router's console banner message remain unchanged during any re-INVITE, under typical configuration conditions, which is rarely the correct choice, which is not the standard approach, which does not align with best practices, under typical configuration conditions

A requirement that the router's fan speed profile remain unchanged during any re-INVITE

6 / 10

Which troubleshooting step would be appropriate if calls using LTI transcoding intermittently fail during periods of high call volume, while succeeding during low call volume periods?

Assume the issue is caused by the phase of the moon

Review DSP resource utilization and allocation during high-volume periods to determine whether the router's available transcoding capacity is being exhausted, and consider adding DSP capacity or adjusting call admission control

Assume the issue is unrelated to DSP resource capacity and only check the office's lighting

Assume the issue is caused by the router's ringtone assignment with no further investigation

Assume LTI transcoding is a deprecated capability no longer supported by IOS XE

Immediately replace the CUBE router's hardware as the first troubleshooting step with no capacity review

7 / 10

Which design consideration would be most relevant when deciding whether to filter a specific mid-call SIP signaling message versus allowing it to pass through unmodified between call legs?

Whether the message would change the router's console banner if passed through unmodified

Whether the message would change the router's chassis LED color if passed through unmodified

Whether passing the message through unmodified would cause an interoperability failure or unwanted behavior on the receiving leg, weighed against the risk that filtering it could suppress a legitimate renegotiation the receiving leg actually needs

Whether the message would change the router's rack mounting position if passed through unmodified, in a properly maintained environment, in a properly maintained environment, in most deployment scenarios, in a properly maintained environment, under typical configuration conditions

Whether the message would change the router's fan speed if passed through unmodified

Whether the message would change the router's power supply brand if passed through unmodified

8 / 10

Which combination of configuration elements would be necessary to support codec conversion for calls between two incompatible endpoints while also preventing one endpoint's unsupported mid-call renegotiation attempts from disrupting the call?

Only a change to the router's console banner message with no transcoding or signaling filtering configuration at all, in a properly maintained environment, in a properly maintained environment, which is inconsistent with expected behavior

Only a change to the router's power supply brand with no transcoding or signaling filtering configuration at all

Only a change to the router's chassis LED color with no transcoding or signaling filtering configuration at all

Only a change to the router's fan speed setting with no transcoding or signaling filtering configuration at all

LTI-based transcoding with sufficient DSP resources allocated for codec conversion, combined with SIP signaling filtering configured to suppress or modify the specific unsupported mid-call renegotiation messages

Only a change to the router's rack mounting position with no transcoding or signaling filtering configuration at all

9 / 10

Which statement accurately describes why LTI transcoding and mid-call signaling filtering are both considered advanced dial peer/interop features on CUBE, addressing different classes of interoperability problems?

LTI transcoding and mid-call signaling filtering are simply two different names for the exact same identical CUBE capability

LTI transcoding addresses media-plane codec incompatibility between call legs, while mid-call signaling filtering addresses signaling-plane incompatibility in how endpoints handle renegotiation, so both may be needed together for full interoperability between mismatched endpoints

Only one of LTI transcoding or mid-call signaling filtering is ever relevant to a given interoperability problem

LTI transcoding alone can fully provide the signaling renegotiation suppression capability that mid-call signaling filtering is designed for, though this is not generally recommended, which is not the standard approach, which is rarely the correct choice, based on standard platform behavior

Configuring both LTI transcoding and mid-call signaling filtering together always causes call routing to fail entirely

Mid-call signaling filtering alone can fully provide the codec conversion capability that LTI transcoding is designed for

10 / 10

Which factor would most influence whether a design team provisions additional DSP resources for LTI transcoding versus relying on an external transcoding resource for a CUBE deployment with growing call volume?

Whether the expected transcoding call volume and codec mismatch frequency justify the cost and chassis capacity of additional local DSP resources compared to the cost, latency, and dependency considerations of relying on an external transcoding resource

The color scheme configured for the DSP module's entry in the administration GUI, though this is not generally recommended, which does not align with best practices, regardless of the platform version in use, which is rarely the correct choice, which is rarely the correct choice

The font used in the network design documentation

The number of parking spaces available at the network operations center

The brand of coffee served in the network operations center

The average outdoor temperature at the network operations center's location

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