CLCOR Voice Gateways And Session Border Controllers Practice Test 2 — 15 Questions

Question 1

Which component in CUBE is responsible for ensuring that the call session is terminated correctly?

Accepted Answer

SIP Stack. The SIP gateway functionality in IOS XE handles the SIP signaling state machine for call termination.

Answer

Dial-peer

Answer

Voice translation-profile

Answer

Voice-class codec

Question 2

You need to enforce a specific codec for calls traversing a CUBE. Where is the most appropriate place to apply this configuration?

Accepted Answer

Voice class codec applied to dial-peer. A voice class codec is defined globally and then applied to the specific dial-peer using the voice-class codec command.

Answer

Global voice service

Answer

SIP profile

Answer

Under the interface

Question 3

A CUBE is receiving calls but rejecting them due to '488 Not Acceptable Here'. What is the most likely reason?

Accepted Answer

Codec mismatch. 488 usually indicates a mismatch in media capabilities (codecs or SDP) offered vs what is configured on the dial-peer.

Answer

Authentication failure

Answer

SIP registration expired

Answer

Dial-peer inactive

Question 4

Which command is used to configure the IP address or hostname of the destination device on a dial-peer?

Accepted Answer

session target. session target ipv4:x.x.x.x is the standard way to define the destination IP.

Answer

target ip

Answer

call target

Answer

destination-ip

Question 5

When configuring CUBE, why would you use a 'voice class uri' command?

Accepted Answer

To match SIP URI host. Voice class URI is used to match incoming SIP requests based on the URI, such as the host portion of the SIP message.

Answer

To define codec

Answer

To route by time

Answer

To match caller ID

Question 6

Which THREE commands are used to configure a SIP profile in CUBE?

Accepted Answer

voice-class sip-profiles apply. SIP profiles require creating a voice class, defining the match/modify rules, and applying it to a dial-peer.

Answer

dial-peer voice

Answer

sip-ua

Question 7

A CUBE is configured for H.450.3 call forwarding, but it is not working. What is the most likely cause?

Accepted Answer

Incompatible signaling protocol. H.450.3 is an H.323 supplementary service, which requires specific H.323 configuration and is often incompatible with SIP-based CUBE deployments without proper interworking.

Answer

Dial-peer not defined

Answer

Codec mismatch

Answer

SIP profile missing

Question 8

Which TWO of the following are required to successfully register a CUBE with a SIP provider?

Accepted Answer

authentication credentials. CUBE registration requires a SIP-UA configuration defining the authentication credentials and the registrar server.

Answer

voice class codec

Answer

dial-peer voice

Answer

voice translation-rule

Question 9

What is the result of applying 'voice translation-profile' to an incoming dial-peer?

Accepted Answer

It modifies the digits. Translation profiles modify incoming or outgoing digits (calling or called numbers) to fit the dial plan.

Answer

It enables SIP

Answer

It changes the codec

Answer

It drops the call

Question 10

Which TWO of the following are valid methods to troubleshoot SIP call failures on a CUBE?

Accepted Answer

show call active voice. debug ccsip messages and show call active voice are the primary tools for diagnosing SIP signaling and active session state.

Answer

debug voice translation

Answer

debug voice class

Answer

show sip-profile status

Question 11

Which TWO of the following are functions performed by the CUBE as a Session Border Controller?

Accepted Answer

Media interworking. CUBE performs topology hiding and media interworking between different SIP networks.

Answer

Call routing in CUCM

Answer

IP phone registration

Answer

Voice mail storage

Question 12

Which TWO of the following are valid components of a Cisco IOS voice gateway configuration?

Accepted Answer

Dial-peers. Dial-peers and voice translation rules are core components of voice gateway configuration.

Answer

Phone button template

Answer

CUCM route pattern

Answer

Device pool

Question 13

Which THREE actions are possible using SIP profiles on a CUBE?

Accepted Answer

Modify SIP headers. SIP profiles can modify headers, remove headers, and add headers to SIP messages.

Answer

Change voice codec

Answer

Route calls to PSTN

Question 14

Which THREE factors influence dial-peer matching for incoming calls on a Cisco IOS XE gateway?

Accepted Answer

answer-address. Incoming dial-peer selection is based on the DNIS (called number), ANI (calling number), and the incoming port/SIP URI.

Answer

destination-pattern

Answer

session target

Question 15

Which TWO of the following are true regarding the use of voice translation-rules?

Accepted Answer

They use regular expressions. Translation rules use regular expressions to match and replace digits.

Answer

They perform load balancing

Answer

They replace the SIP protocol

Answer

They define the codec