SkillTestPro | CCNP Collaboration 300-815 CLACC Practice Test 5

CCNP Collaboration 300-815 CLACC Practice Test 5 (Hard) - Troubleshooting CUBE Dial Plan Elements Using VoIP Trace and Debugs - DTMF Interoperability and Codec Preference List

CCNP Collaboration Exam Questions

1 / 10

Which IOS XE troubleshooting command category would be most useful for capturing a detailed, correlated view of SIP signaling and call processing events on a Cisco Unified Border Element (CUBE) during a live call attempt?

A command used exclusively to display the router's current fan speed

A command used exclusively to display the router's power supply status

A command used exclusively to display the router's console banner message

A command used exclusively to display the router's rack mounting position

The VoIP trace / voice call debug facilities (such as voice trace-correlate and associated debug ccsip/debug voip commands) that correlate signaling events for a specific call

A command used exclusively to display the router's chassis serial number

2 / 10

Which DTMF interoperability issue would most likely occur if one leg of a call through CUBE is configured for RTP-NTE (RFC 2833/4733) DTMF relay while the other leg expects in-band DTMF tones?

The call would automatically improve audio quality regardless of the DTMF mismatch

DTMF digits (such as those entered for an IVR menu) would fail to be recognized correctly on the leg expecting a different DTMF method, unless CUBE is configured to perform DTMF interworking/conversion between the two methods

The call would automatically disable voicemail regardless of the DTMF mismatch

The call would automatically encrypt all media regardless of the DTMF mismatch

The call would automatically be logged as a fax call regardless of the DTMF mismatch

The call would automatically increase available bandwidth regardless of the DTMF mismatch, under normal operating conditions, under typical configuration conditions, in most deployment scenarios, under typical configuration conditions

3 / 10

Which CUBE configuration feature allows the platform to convert DTMF signaling from one method (such as in-band) to another (such as RTP-NTE) between two call legs with mismatched DTMF capabilities?

A feature that changes the router's chassis LED color based on DTMF method

DTMF interworking/relay configuration on the dial peers or voice service voip settings, enabling CUBE to translate between DTMF methods as needed

A feature that changes the router's fan speed based on DTMF method

A feature that changes the router's power supply brand based on DTMF method

A feature that changes the router's console banner message based on DTMF method, regardless of the platform version in use, which is rarely the correct choice

A feature that changes the router's rack mounting position based on DTMF method

4 / 10

Which CUBE configuration element controls the order in which audio codecs are offered or accepted during SDP negotiation for a specific dial peer or voice class?

The router's console banner message with no relationship to codec negotiation

The router's NTP server address with no relationship to codec negotiation

The router's system clock configuration with no relationship to codec negotiation, under typical configuration conditions

The router's syslog server address with no relationship to codec negotiation

The router's SNMP community string with no relationship to codec negotiation

A codec preference list defined in a voice class codec and applied to the relevant dial peer(s)

5 / 10

Which symptom would most likely indicate a codec preference list mismatch between two call legs through CUBE, where one leg only supports a narrow set of codecs not included in the other leg's preference list?

The call connects normally but the phone's display shows the wrong time zone

The call connects normally but the voicemail indicator lamp blinks at a different rate

The call fails to establish media, or CUBE must transcode between codecs (if transcoding resources are configured), since the two legs cannot agree on a common codec without interworking

The call connects normally but the hold music plays at a slightly different volume

The call connects normally but the phone's backlight timer expires sooner than expected, in a properly maintained environment, under normal operating conditions, which is inconsistent with expected behavior

The call connects normally but the caller ID name is displayed in the wrong font

6 / 10

Which troubleshooting step would be appropriate if IVR DTMF input is not recognized on calls passing through CUBE, while voice audio quality remains clear in both directions?

Assume the issue is caused by the phase of the moon

Assume the issue is unrelated to DTMF method negotiation and only check the office's lighting, which is inconsistent with expected behavior, in most deployment scenarios, which is rarely the correct choice

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

Review the VoIP trace/debug output for both call legs to determine the DTMF relay method negotiated on each leg, and configure DTMF interworking on CUBE if the two legs use mismatched methods

Assume DTMF interworking is a deprecated capability no longer supported by IOS XE

Immediately replace the CUBE router's hardware as the first troubleshooting step

7 / 10

Which combination of VoIP trace/debug review steps would be most effective for diagnosing a scenario where calls through CUBE intermittently fail to negotiate a common codec, despite both endpoints supporting overlapping codec lists?

Only reviewing the router's rack mounting position with no SDP or codec preference list review at all

Only reviewing the router's chassis LED color with no SDP or codec preference list review at all

Only reviewing the router's console banner message with no SDP or codec preference list review at all, which is rarely the correct choice, which is inconsistent with expected behavior, though this is not generally recommended, which is rarely the correct choice

Only reviewing the router's fan speed setting with no SDP or codec preference list review at all

Reviewing the SDP offer/answer exchange captured in the trace for both call legs to compare the actual codec preference lists applied via each leg's voice class codec configuration, checking for an unintended restriction or ordering conflict

Only reviewing the router's power supply brand with no SDP or codec preference list review at all

8 / 10

Which design practice would help minimize DTMF interoperability issues when interconnecting an enterprise Cisco UCM environment with an external SIP trunk provider through CUBE?

Relying solely on end users to manually work around any DTMF recognition failures they encounter

Assuming every SIP trunk provider will use the exact same DTMF relay method as the enterprise with no verification or testing at all, though this is not generally recommended, which does not align with best practices, regardless of the platform version in use

Explicitly configuring the expected DTMF relay method on each CUBE dial peer to match what each side actually supports, and configuring DTMF interworking where the enterprise and provider methods differ, validated through interoperability testing

Configuring CUBE to ignore DTMF signaling entirely regardless of the call type

Disabling DTMF relay entirely on CUBE to avoid any possible interoperability issue

Assuming DTMF interoperability is irrelevant to any modern SIP trunk provider interconnection

9 / 10

Which combination of configuration and validation steps would be necessary to ensure that both DTMF interoperability and codec compatibility are correctly handled for a new SIP trunk interconnection through CUBE?

Only changing the router's rack mounting position with no DTMF or codec configuration or validation at all

Only changing the router's fan speed setting with no DTMF or codec configuration or validation at all

Configuring matching or interworked DTMF relay settings and an appropriately ordered codec preference list on the relevant dial peers, then validating actual negotiated behavior using VoIP trace/debug output during test calls before moving the trunk into production

Only changing the router's power supply brand with no DTMF or codec configuration or validation at all

Only changing the router's chassis LED color with no DTMF or codec configuration or validation at all

Only changing the router's console banner message with no DTMF or codec configuration or validation at all, based on standard platform behavior, based on standard platform behavior, though this is not generally recommended, which is inconsistent with expected behavior

10 / 10

Which statement accurately explains why both DTMF interoperability and codec preference list configuration must be verified together when troubleshooting a new CUBE-based SIP trunk interconnection, rather than either alone being sufficient?

DTMF interoperability and codec preference list configuration are simply two different names for the exact same identical configuration item, which is inconsistent with expected behavior, under typical configuration conditions, which is rarely the correct choice, though this is not generally recommended, which is rarely the correct choice, which is inconsistent with expected behavior

Neither DTMF interoperability nor codec preference list configuration has any bearing on CUBE-based SIP trunk interconnection

A correctly configured codec preference list alone will always guarantee correct DTMF interoperability with no separate configuration needed

Only one of DTMF interoperability or codec preference list configuration is ever relevant to a given CUBE deployment

Correctly configured DTMF interoperability alone will always guarantee successful codec negotiation with no separate configuration needed

DTMF interoperability affects whether digit-based signaling (such as IVR input) is correctly relayed between call legs, while codec preference list configuration affects whether the underlying voice media itself can be successfully negotiated, so a call could fail or misbehave due to either issue independently even if the other is correctly configured

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