350-801 Question #99: Real Exam Question with Answer & Explanation

The correct answer is A: isdn bchan-number-order ascending. The isdn bchan-number-order ascending command configures an IOS router to select ISDN B-channels starting from the lowest available channel number, which satisfies the requirement for outgoing calls to begin on channel 1.

Voice Gateways and Session Border Controllers

Question

Due to provider requirements, outgoing calls from the Enterprise to the PSTN must start with channel 1. Which ISDN command changes the channel selection on IOS to meet this requirement?

Options

Aisdn bchan-number-order ascending
Bisdn protocol-emulate network
Cisdn incoming-voice
Disdn bchan-number-order decending

Explanation

The isdn bchan-number-order ascending command configures an IOS router to select ISDN B-channels starting from the lowest available channel number, which satisfies the requirement for outgoing calls to begin on channel 1.

Common mistakes.

B. The isdn protocol-emulate network command configures the ISDN interface to emulate a network device, typically used for testing or specific interoperability, not for channel selection order.
C. The isdn incoming-voice command specifies that the ISDN interface should process incoming calls as voice calls, not controlling the outgoing channel selection order.
D. The isdn bchan-number-order decending command would cause the router to select B-channels in decreasing order, starting from the highest available channel, which contradicts the requirement to start with channel 1.

Concept tested. ISDN B-channel selection order

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/isdn/command/isdn-cr-book/isdn-i1.html#wp2220790875

Topics

#ISDN#Voice Gateway Configuration#B-Channel Selection#Cisco IOS

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