350-801 Question #330: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer configures ISDN on a voice gateway. The provider confirms that the PRI is configured with 10 channels the engineer ordered and is working from the provider side, but the engineer cannot get a B-channel to carry voice. The rest of the configuration for the serial interface and voice network is functioning correctly. Which actions must be taken to carry voice?

Options

• AThe engineer must activate the controller card on the voice gateway before configuring the
• BThe engineer used a T1 interface but must use an E1 interface.
• CThe pri-group timeslots command must be 0-9 for the 10 channels because all values on a
• DThe engineer must manually revert the order of using the channels.

Explanation

To resolve the issue of an ISDN PRI B-channel not carrying voice, despite provider confirmation, the engineer must ensure the controller card on the voice gateway is activated.

Common mistakes.

• B. Without the exhibit, it is not possible to determine if the incorrect interface type (T1/E1) is being used. The problem description suggests a functioning setup except for voice channels.
• C. The pri-group timeslots command configures the B-channels; if 10 channels are ordered, 0-9 is a valid range. The issue is not in the channel definition but the controller's operational state.
• D. There is no standard configuration or troubleshooting step that involves manually reverting the order of using channels to resolve a PRI B-channel issue.

Concept tested. ISDN PRI controller activation

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/vcr-e/vcr-e-cr-book/vcr-e-cr-pri-config.html

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