350-801 · Question #330
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…
The correct answer is A. The engineer must activate the controller card on the voice gateway before configuring the. 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.
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?
Exhibit
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.
How the community answered
(32 responses)- A88% (28)
- B3% (1)
- C3% (1)
- D6% (2)
Why each option
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.
For an ISDN PRI interface to function and carry voice, the associated controller (T1 or E1) on the voice gateway must be activated. This is typically done with a `no shutdown` command under the controller configuration, which is essential for bringing up the physical layer and allowing channel usage.
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.
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.
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
Source: 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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