MS-720 Question #126: Real Exam Question with Answer & Explanation

Question

You have a Microsoft Teams Phone deployment. The 613 7010 5XXX phone number range is allocated to the Session Border Controller (SBC). A user named User1 is configured as shown in the following exhibit. User1 reports that when an external caller attempts to call the phone number of User1, the external caller receives an error message. User1 can make outbound calls, but no caller ID appears. Which two commands should you run to resolve the issues? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.

Options

• AGrant-CsOnlineVoiceRoutingPolicy -Identity [email protected] -PolicyName $null
• BSet-CsOnlineVoiceUser [email protected] -TelephoneNumber $null
• CSet-CsUser [email protected] -OnPremLineURI "tel:+61370105555"
• DSet-CsUser [email protected] -EnterpriseVoiceEnabled $false
• ESet-CsOnlineVoiceUser [email protected] -TelephoneNumber "+61370105555"

Explanation

C is correct because the phone range is allocated to the SBC, meaning this is a Direct Routing deployment - which requires numbers to be assigned via Set-CsUser -OnPremLineURI, not via Set-CsOnlineVoiceUser -TelephoneNumber (which is for Calling Plans). D (-EnterpriseVoiceEnabled $true) is correct because the exhibit shows Enterprise Voice is disabled for User1; without it enabled, the user's DID number is not presented as caller ID on outbound calls, and inbound routing through the SBC cannot complete.

Why the distractors are wrong:

• A removes the voice routing policy entirely, which would break outbound calling - the opposite of what's needed.
• B nulls out TelephoneNumber, which is a Calling Plan field and irrelevant to this Direct Routing scenario.
• E uses Set-CsOnlineVoiceUser -TelephoneNumber, the Calling Plan cmdlet - wrong for SBC/Direct Routing; it will not map the number through the SBC correctly.

Memory tip: Think "SBC = Set-CsUser + OnPremLineURI." Whenever you see a Session Border Controller, you're in Direct Routing territory - use the CsUser cmdlet with OnPremLineURI, never CsOnlineVoiceUser with TelephoneNumber. If a user can dial out but has no caller ID, check EnterpriseVoiceEnabled first.

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